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 9186 by the denominator 76 (which you can enter in any calculator):
9186 (numerator) ÷ 76 (denominator) = 120.87
And finally, you get 120.87 as your answer when you convert 120 66/76 (or 9186/76) to a decimal.