Step 1:
The first step to converting 16872.581578935 to a fraction is to re-write 16872.581578935 in the form p/q where p and q are both positive integers. To start with, 16872.581578935 can be written as simply 16872.581578935/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 16872.581578935, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 16872.581578935/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 16872.581578935/1 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 16872.581578935 as a fraction:
118108/7 / 1