Step 1:
The first step to converting 128501.21043539 to a fraction is to re-write 128501.21043539 in the form p/q where p and q are both positive integers. To start with, 128501.21043539 can be written as simply 128501.21043539/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 128501.21043539, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 128501.21043539/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 128501.21043539/1 each by 100000000:
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 128501.21043539 as a fraction:
514005/4 / 1