The triangles are similar.

What is the value of X?

i think the answer is 40

x= 12

Step-by-step explanation:

when you do 17×4= 68

8×4=32

and 15×4= 60

but we still need to find out x so 4x+12= 60

so start pluging number into x.  and when you plug in 12, 4(12)+12 you get 60 so x=12

i'm pretty sure it's 477,585,296, but perhaps my math is incorrect.