DURING TAXI IN TO THE FBO A CE525 FLT CREW HAS THE RIGHT WING TIP CONTACT THE PROPELLER SPINNER OF A C172 PARKED ALONG THE TXWY.

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WE GOT OFF OF THE END OF THE RWY; AND ASKED ATC (GND CTL) FOR PROGRESSIVE INSTRUCTIONS TO THE FBO. THEY SAID TO MAKE A R TURN ON TXWY B THEN WE WILL SEE THE FBO HANGARS. WE PROCEED TO MAKE THE R TURN AS TOLD; THEN WE BOTH SAW HANGARS ON THE L; AS DESCRIBED BY THE TWR. AFTER WE TURNED; WE BOTH DISCUSSED HOW IT DID NOT LOOK RIGHT. I CALLED THE TWR ONCE AGAIN TO CONFIRM THAT WE WERE IN THE RIGHT AREA. THE TWR THEN STATED THAT HE COULD NO LONGER SEE US. THE CAPT STOPPED BRIEFLY AT THIS TIME OR SLOWED DOWN TO AN ALMOST STOP; WHEN HE SAID; 'I THINK THERE'S THE FOLLOW ME VEHICLE;' AND I AGREED. THE CAPT THEN JUST TURNED R TOWARDS THE VEHICLE; DOWN A VERY TIGHT ROW OF SMALLER PROP ACFT. I WAS VERY UNCOMFORTABLE WITH THIS DECISION; BUT IT WAS NEVER DISCUSSED AT THAT TIME THAT HE WAS JUST GOING TO TURN R TOWARDS THE TRUCK. THE CAPT SLOWED DOWN; KNOWING THAT THIS WAS A REALLY TIGHT PLACE TO BE. WE SHOULD HAVE JUST STOPPED THERE. HE REQUESTED FOR ME TO WATCH MY WING AND HE WOULD WATCH HIS; AND I AGREED TO. AS WE GOT CLOSER TO THE AIRPLANE THAT WE STRUCK; I STARTED TO SAY THAT WE WERE REALLY; REALLY; REALLY CLOSE; AND BEFORE I COULD SAY ANYTHING; IT SEEMED THAT WE PICKED UP A LITTLE SPD AND IT WAS TOO LATE. I COULDN'T GET OUT ANOTHER WORD BEFORE WE STRUCK THE NOSECONE OF A C172 WITH OUR R WINGTIP. AFTER THAT; THE CAPT JUST CONTINUED DOWN THE ROW; FOLLOWING THE TRUCK TO THE FBO. WHAT I SHOULD HAVE DONE DIFFERENT AND LEARNED FROM THIS: EVEN AS SIC; I NEED TO BE MORE DECLARATIVE WHEN I AM NOT COMFORTABLE WITH THE DECISION AND IF NEED BE; DO WHAT I NEED TO. AS THE CAPT MADE THE TURN DOWN THE ROW; I SHOULD HAVE STATED AT THAT TIME; THAT I WAS NOT COMFORTABLE; AND THAT I COULDN'T BE RESPONSIBLE FOR THE WING. LET'S STOP RIGHT HERE. MORE CRM SHOULD HAVE BEEN MADE. IF YOUR GUT TELLS YOU IT'S WRONG; IT IS TOO CLOSE; THEN IT IS. DON'T TAKE CHANCES!