4.68 is essentially 4.68 / 1.
To make 1 becomes 100, you have to multiply it by 100 - easy, right?
BUT if you want to keep the value of the fraction the same, you must also multiply the numerator (the part above the line) by the same number, which is 100 in this situation.
SO it will be (4.68 x 100) / (1 x 100) => 468 / 100