Step 1:
The first step to converting 398177.8657971 to a fraction is to re-write 398177.8657971 in the form p/q where p and q are both positive integers. To start with, 398177.8657971 can be written as simply 398177.8657971/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 398177.8657971, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 398177.8657971/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 398177.8657971/1 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 398177.8657971 as a fraction:
398178/1 / 1