Step 1:
The first step to converting 620890.68391089 to a fraction is to re-write 620890.68391089 in the form p/q where p and q are both positive integers. To start with, 620890.68391089 can be written as simply 620890.68391089/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 620890.68391089, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 620890.68391089/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 620890.68391089/1 each by 100000000:
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 620890.68391089 as a fraction:
620891/1 / 1