Claire correctly solved the proportion x/4 = 36/16 for x using cross products to get the equation 16x = 144 and then dividing both sides by 16 to get x =9 . She showed that she can use cross products to solve the proportion because she gets the same answer if the solves it as shown


what property allowed her to go from x/4= 36/16 to x/4 x = 36/16 x 4?