9514 1404 393
Answer:
 x = 12
 y = 4√10
 z = 12√10
Explanation:
The geometric mean rules apply. Each of the segments labeled with a letter is the geometric mean of the segments it touches on the hypotenuse.
 x = √(4×36) = 12
 y = √(4×(4+36)) = 4√10
 z = √(36×(36+4)) = 12√10