Corresponding sides on either side of ED are proprotional, so
(x+2)/112 = 62/99.2
x +2 = 112*62/99.2 = 70
x = 68 feet
usually x means "a number unknown" like if i were to write 8x that means 8 times a number unowen. these are seen in equations such as 8x =48
x +2 = 112*62/99.2 = 70
x = 68 feet