Step 1:
The first step to converting 17642.399643225 to a fraction is to re-write 17642.399643225 in the form p/q where p and q are both positive integers. To start with, 17642.399643225 can be written as simply 17642.399643225/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 17642.399643225, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 17642.399643225/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 17642.399643225/1 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 17642.399643225 as a fraction:
88212/5 / 1