Step 1:
The first step to converting 21488.015884257 to a fraction is to re-write 21488.015884257 in the form p/q where p and q are both positive integers. To start with, 21488.015884257 can be written as simply 21488.015884257/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 21488.015884257, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 21488.015884257/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 21488.015884257/1 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 21488.015884257 as a fraction:
21488/1 / 1