Step 1:
The first step to converting 12798.620859313 to a fraction is to re-write 12798.620859313 in the form p/q where p and q are both positive integers. To start with, 12798.620859313 can be written as simply 12798.620859313/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 12798.620859313, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 12798.620859313/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 12798.620859313/1 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 12798.620859313 as a fraction:
102389/8 / 1