Absolute Poker
No Limit Holdem Tournament
Blinds: t75/t150
9 players
Converter

Stack sizes:
Hero: t15175
UTG+1: t8415
MP1: t9570
MP2: t8300
MP3: t4300
CO: t11560
Button: t6325
SB: t4655
BB: t7760

Pre-flop: (9 players) Hero is UTG with
Hero raises to t600, 4 folds, CO calls t600 (pot was t825), 3 folds.

Flop: (t1425, 2 players)
Hero bets t900, CO calls t900 (pot was t2325).

Turn: (t3225, 2 players)
Hero bets t2400, CO raises to t4800, Hero raises all-in t13675, CO calls all-in t5260.
Uncalled bets: t3615 returned to Hero.

River: (t23345, 0 player + 2 all-in - Main pot: t23345)


Results:
Final pot: t23345
CO Shows 7s 8c
Hero Shows Ad Ac

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4xBB is probably not enough to scare 78 away.
I would have just called his Turn re-raise, and hope he won't bet again on river.
If he goes all in I will fold.