Step 1:
The first step to converting 12659.978173827 to a fraction is to re-write 12659.978173827 in the form p/q where p and q are both positive integers. To start with, 12659.978173827 can be written as simply 12659.978173827/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 12659.978173827, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 12659.978173827/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 12659.978173827/1 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 12659.978173827 as a fraction:
569699/45 / 1