A fraction is usually split into two parts: the first part is the number on top, called the numerator; and the second part is the number on the bottom, called the denominator. These are both separated by a line called the “divisor line”. We can use the division method help to solve this question: to get a decimal, simply divide the numerator 8586 by the denominator 136 (which you can enter in any calculator):
8586 (numerator) ÷ 136 (denominator) = 63.13
And finally, you get 63.13 as your answer when you convert 63 18/136 (or 8586/136) to a decimal.