Step 1:
The first step to converting 43640.509978128 to a fraction is to re-write 43640.509978128 in the form p/q where p and q are both positive integers. To start with, 43640.509978128 can be written as simply 43640.509978128/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 43640.509978128, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 43640.509978128/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 43640.509978128/1 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 43640.509978128 as a fraction:
87281/2 / 1