CLOSE PROX 2 GA-SMA ACFT IN TRAFFIC AT GXY. INCIDENT REPORTED BY LEAD ACFT AND INSTRUCTOR IN THIRD ACFT WHO GAVE A TRAFFIC ADVISORY.

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I; THE PLT OF SMA X; SHORTLY AFTER ANNOUNCING THAT I WAS FINAL FOR RWY 27 AT WELD COUNTY ARPT; HEARD OTHER PLTS TELLING THE #2 ON FINAL TO GO AROUND AND GET OUT OF THERE. NOT BEING ABLE TO FIND AN ACFT IN FRONT OF ME; I WAS REASONABLY SURE I WAS NOT THE ACFT THEY WERE TALKING TO. THIS ACFT DID NOT SEEM TO BE RESPONDING TO THE CALLS WHICH WERE BECOMING MORE URGENT. I DECIDED NOT TO CHANCE A GO AROUND MYSELF AS I FIGURED THE ACFT MIGHT BE ABOVE AND BEHIND ME AND THEREFORE MIGHT WORSEN THE SITUATION. JUST BEFORE T/D I SAW THE OTHER PLANE FLY JUST OVER AND TO THE RIGHT; APPARENTLY JUST THEN GOING AROUND. I NEVER DID HEAR A RESPONSE OVER THE RADIO FROM THE OTHER ACFT; NOT EVEN WHEN THE PLANE DID GO AROUND. I DO NOT KNOW HOW CLOSE THE PLANE HAD GOTTEN; BUT WHEN I DID SEE THE OTHER ACFT GOING AROUND THEY WERE NOT MUCH MORE THAN 75' ABOVE MY PLANE AND TO THE RIGHT. SUPPLEMENTAL INFO FROM ACN 98901: SMA Y OBSERVED AS #2 ON SHORT FINAL OVERTAKING SMA X. SMA Y APPEARED TO BE UNAWARE OF THE SMA X AHEAD. RADIO CALL MADE IN THE BLIND TO ACFT ON 122.8 FOR ACFT #2 TO GO AROUND; BUT NO RESPONSE OBSERVED. SECOND RADIO CALL MADE AS #2 ACFT ADVANCED TO APPROX 2 FUSELAGE LENGTHS BEHIND LEAD ACFT STATING TO THE EFFECT; 'GET OUT OF THERE; YOU DAMNED FOOL.' SMA Y EXECUTED A MISSED APCH BY COMMENCING A RIGHT CLBING TURN.