Step 1:
The first step to converting 53721.918243762 to a fraction is to re-write 53721.918243762 in the form p/q where p and q are both positive integers. To start with, 53721.918243762 can be written as simply 53721.918243762/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 53721.918243762, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 53721.918243762/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 53721.918243762/1 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 53721.918243762 as a fraction:
644663/12 / 1