Step 1:
The first step to converting 398279.439067 to a fraction is to re-write 398279.439067 in the form p/q where p and q are both positive integers. To start with, 398279.439067 can be written as simply 398279.439067/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 398279.439067, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 398279.439067/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 398279.439067/1 each by 1000000:
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 398279.439067 as a fraction:
796559/2 / 1