Step 1:
The first step to converting 11997.879564509 to a fraction is to re-write 11997.879564509 in the form p/q where p and q are both positive integers. To start with, 11997.879564509 can be written as simply 11997.879564509/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 11997.879564509, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 11997.879564509/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 11997.879564509/1 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 11997.879564509 as a fraction:
95983/8 / 1