Step 1:
The first step to converting 99640.900546878 to a fraction is to re-write 99640.900546878 in the form p/q where p and q are both positive integers. To start with, 99640.900546878 can be written as simply 99640.900546878/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 99640.900546878, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 99640.900546878/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 99640.900546878/1 each by 1000000000:
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 99640.900546878 as a fraction:
99641/1 / 1