Step 1:
The first step to converting 637721.4536478 to a fraction is to re-write 637721.4536478 in the form p/q where p and q are both positive integers. To start with, 637721.4536478 can be written as simply 637721.4536478/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 637721.4536478, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 637721.4536478/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 637721.4536478/1 each by 10000000:
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 637721.4536478 as a fraction:
637721/1 / 1