Final table floor decision

[RR]

Here is a floor decision I became aware of last night. The floor got it right, but there was quite a bit of dissension about what the correct ruling was. UTG goes all-in, UTG +2 goes all-in, and then UTG+4 (in the 10 seat) goes all-in. Next the dealer reaches out and mucks the 10 seat's cards. The floor is called and has to rule on what should happen next. The floor got it right, but I won't mention what he ruled as that would really alter the perception of what should happen. So tell me 2+2, what should be done to rectify this situation?