Step 1:
The first step to converting 49.721137580128 to a fraction is to re-write 49.721137580128 in the form p/q where p and q are both positive integers. To start with, 49.721137580128 can be written as simply 49.721137580128/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 49.721137580128, which in this case is 12. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 49.721137580128/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 49.721137580128/1 each by 1000000000000:
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 49.721137580128 as a fraction:
5171/104 / 1