Step 1:
The first step to converting 81645.215936355 to a fraction is to re-write 81645.215936355 in the form p/q where p and q are both positive integers. To start with, 81645.215936355 can be written as simply 81645.215936355/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 81645.215936355, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 81645.215936355/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 81645.215936355/1 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 81645.215936355 as a fraction:
326581/4 / 1