Step 1:
The first step to converting 13173.8390585 to a fraction is to re-write 13173.8390585 in the form p/q where p and q are both positive integers. To start with, 13173.8390585 can be written as simply 13173.8390585/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 13173.8390585, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 13173.8390585/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 13173.8390585/1 each by 10000000:
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 13173.8390585 as a fraction:
79043/6 / 1