To find the percentage of a number, all you have to do is multiply the number by the percent in decimal form. Therefore, 39=52x. Let's solve via inverse operations: 39/52=52x/52. x=0.75. BUT WAIT. That's NOT 0.75%! Because percent means "parts of a hundred," we can set 0.75 equal to 75/100. This numerator is your percent. In other words, you have to multiply the decimal you get by 100 to get your percent. 0.75*100=75%.
Answer: 75%