Step 1:
The first step to converting 839870.21399036 to a fraction is to re-write 839870.21399036 in the form p/q where p and q are both positive integers. To start with, 839870.21399036 can be written as simply 839870.21399036/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 839870.21399036, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 839870.21399036/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 839870.21399036/1 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 839870.21399036 as a fraction:
839870/1 / 1