3-way calling action on the bubble

[Gramps]

At first glance this call probably looks totally flammable (and may still be), but here it goes. My assumptions in making it were that:

(a) UTG could be pushing a pretty wide range here with his "biggest stack" [though this is the first bubble hand as a short stack just got eliminated];

(b) the button may very well think UTG is pushing any two, and probably knows that he's going to have to make a stand first (before I have to) - i.e. his call doesn't necessarily mean a premium hand;

(c) if the button beats UTG, he's in 3rd at 2,330 and I'm at 1,055 with a little fold equity (maybe), and two hands to push.

(d) if UTG beats the button, me and my 1,055 chips will finish 3rd the vast majority of the time.

Still too loose, or no?

Party Poker No-Limit Hold'em Tourney, Big Blind is t300 (4 handed) converter

UTG (t4240)
Button (t940)
Hero (t1205)
BB (t3615)

Preflop: Hero is SB with 9[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to t4240 (All-In)</font>, Button calls t940 (All-In), Hero calls t1055 (All-In), <font color="#666666">1 fold</font>.

If the call is too loose, where does the "call/fold threshold" lie here and why? Any of the above assumptions likely to be incorrect?