Step 1:
The first step to converting 665931.9809089 to a fraction is to re-write 665931.9809089 in the form p/q where p and q are both positive integers. To start with, 665931.9809089 can be written as simply 665931.9809089/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 665931.9809089, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 665931.9809089/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 665931.9809089/1 each by 10000000:
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 665931.9809089 as a fraction:
665932/1 / 1