Step 1:
The first step to converting 21894.250396519 to a fraction is to re-write 21894.250396519 in the form p/q where p and q are both positive integers. To start with, 21894.250396519 can be written as simply 21894.250396519/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 21894.250396519, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 21894.250396519/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 21894.250396519/1 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 21894.250396519 as a fraction:
87577/4 / 1