Step 1:
The first step to converting 266171.9539872 to a fraction is to re-write 266171.9539872 in the form p/q where p and q are both positive integers. To start with, 266171.9539872 can be written as simply 266171.9539872/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 266171.9539872, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 266171.9539872/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 266171.9539872/1 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 266171.9539872 as a fraction:
266172/1 / 1