Step 1:
The first step to converting 7139.400078128 to a fraction is to re-write 7139.400078128 in the form p/q where p and q are both positive integers. To start with, 7139.400078128 can be written as simply 7139.400078128/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 7139.400078128, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 7139.400078128/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 7139.400078128/1 each by 1000000000:
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 7139.400078128 as a fraction:
35697/5 / 1