Step 1:
The first step to converting 27921.138925781 to a fraction is to re-write 27921.138925781 in the form p/q where p and q are both positive integers. To start with, 27921.138925781 can be written as simply 27921.138925781/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 27921.138925781, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 27921.138925781/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 27921.138925781/1 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 27921.138925781 as a fraction:
195448/7 / 1