Step 1:
The first step to converting 1339.6870312487 to a fraction is to re-write 1339.6870312487 in the form p/q where p and q are both positive integers. To start with, 1339.6870312487 can be written as simply 1339.6870312487/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 1339.6870312487, which in this case is 10. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 1339.6870312487/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 1339.6870312487/1 each by 10000000000:
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 1339.6870312487 as a fraction:
21435/16 / 1