Step 1:
The first step to converting 213972.48645721 to a fraction is to re-write 213972.48645721 in the form p/q where p and q are both positive integers. To start with, 213972.48645721 can be written as simply 213972.48645721/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 213972.48645721, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 213972.48645721/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 213972.48645721/1 each by 100000000:
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 213972.48645721 as a fraction:
427945/2 / 1