Step 1:
The first step to converting 398504.9878125 to a fraction is to re-write 398504.9878125 in the form p/q where p and q are both positive integers. To start with, 398504.9878125 can be written as simply 398504.9878125/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 398504.9878125, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 398504.9878125/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 398504.9878125/1 each by 10000000:
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 398504.9878125 as a fraction:
398505/1 / 1