Step 1:
The first step to converting 20710.485590386 to a fraction is to re-write 20710.485590386 in the form p/q where p and q are both positive integers. To start with, 20710.485590386 can be written as simply 20710.485590386/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 20710.485590386, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 20710.485590386/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 20710.485590386/1 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 20710.485590386 as a fraction:
41421/2 / 1