Step 1:
The first step to converting 18481.559438373 to a fraction is to re-write 18481.559438373 in the form p/q where p and q are both positive integers. To start with, 18481.559438373 can be written as simply 18481.559438373/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 18481.559438373, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 18481.559438373/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 18481.559438373/1 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 18481.559438373 as a fraction:
129371/7 / 1