Step 1:
The first step to converting 641351866.20797 to a fraction is to re-write 641351866.20797 in the form p/q where p and q are both positive integers. To start with, 641351866.20797 can be written as simply 641351866.20797/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 641351866.20797, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 641351866.20797/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 641351866.20797/1 each by 100000:
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 641351866.20797 as a fraction:
641351866/1 / 1