So if 72/108=x/54, we just need to cross multiply to obtain x.
Step 1: Multiply 72x54 and 108 by x
Step 2: We are left with 3888=108x
Step 3: Since 108 is multiplied to x, take it on the other side of the equation and divide 3888 by it
Step 4: 3888 ÷ 108 = x
Step 5: x=72
