Please see the photo.
The "power of the point": DB · DC = DF · DE
4 · [ 4 + (x - 3) ] = 5 · [ 5 + (x - 6) ]
4 · [ x + 1 ] = 5 · [ x - 1 ]
4x + 4 = 5x - 5
x = 9
From this, you can find all the lengths ...