Step 1:
The first step to converting 20591.433578935 to a fraction is to re-write 20591.433578935 in the form p/q where p and q are both positive integers. To start with, 20591.433578935 can be written as simply 20591.433578935/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 20591.433578935, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 20591.433578935/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 20591.433578935/1 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 20591.433578935 as a fraction:
144140/7 / 1