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 27618 by the denominator 873 (which you can enter in any calculator):
27618 (numerator) ÷ 873 (denominator) = 31.64
And finally, you get 31.64 as your answer when you convert 31 555/873 (or 27618/873) to a decimal.