Answer:
400
Step-by-step explanation:
Use the right triangle altitude theorem.
All three triangles are similar, so we can write a proportion of corresponding side lengths.
Let y = x - 144
192/144 = y/192
144y = 192 * 192
144y = 36,864
y = 256
x = y + 144 = 256 + 144
x = 400
