Step 1:
The first step to converting 398076.50978997 to a fraction is to re-write 398076.50978997 in the form p/q where p and q are both positive integers. To start with, 398076.50978997 can be written as simply 398076.50978997/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 398076.50978997, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 398076.50978997/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 398076.50978997/1 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 398076.50978997 as a fraction:
796153/2 / 1