On the first bounce, it will reach 1/4 x 256 height.
1/4 x 256 = 64
On the second bounce it will reach 64 x 1/4 height.
64 x 1/4 = 16
On the third bounce it will reach 16 x 1/4 height.
16 x 1/4 = 4.
You're final answer should be 4 feet. Hope this helps!