Step 1:
The first step to converting 15648.640019539 to a fraction is to re-write 15648.640019539 in the form p/q where p and q are both positive integers. To start with, 15648.640019539 can be written as simply 15648.640019539/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 15648.640019539, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 15648.640019539/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 15648.640019539/1 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 15648.640019539 as a fraction:
172135/11 / 1