Step 1:
The first step to converting 17239.905978578 to a fraction is to re-write 17239.905978578 in the form p/q where p and q are both positive integers. To start with, 17239.905978578 can be written as simply 17239.905978578/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 17239.905978578, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 17239.905978578/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 17239.905978578/1 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 17239.905978578 as a fraction:
172399/10 / 1