Step 1:
The first step to converting 901.6599999979 to a fraction is to re-write 901.6599999979 in the form p/q where p and q are both positive integers. To start with, 901.6599999979 can be written as simply 901.6599999979/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 901.6599999979, which in this case is 10. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 901.6599999979/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 901.6599999979/1 each by 10000000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 901.6599999979 as a fraction:
42378/47 / 1