Step 1:
The first step to converting 85.220861816475 to a fraction is to re-write 85.220861816475 in the form p/q where p and q are both positive integers. To start with, 85.220861816475 can be written as simply 85.220861816475/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 85.220861816475, which in this case is 12. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 85.220861816475/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 85.220861816475/1 each by 1000000000000:
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 85.220861816475 as a fraction:
6562/77 / 1