Step 1:
The first step to converting 20828.508650788 to a fraction is to re-write 20828.508650788 in the form p/q where p and q are both positive integers. To start with, 20828.508650788 can be written as simply 20828.508650788/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 20828.508650788, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 20828.508650788/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 20828.508650788/1 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 20828.508650788 as a fraction:
41657/2 / 1