What is the length of AC?

Answer:
B. 136
Step-by-step explanation:
Δ ABC ≅ ΔEDC
so
AC/AB = CE/ED
(144-x)/51 = x/3
51x = 3(144-x)
51x = 432 - 3x
54x = 432
x = 8
AC = 144 - 8
AC = 136