Step 1:
The first step to converting 166256297.21687 to a fraction is to re-write 166256297.21687 in the form p/q where p and q are both positive integers. To start with, 166256297.21687 can be written as simply 166256297.21687/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 166256297.21687, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 166256297.21687/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 166256297.21687/1 each by 100000:
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 166256297.21687 as a fraction:
166256297/1 / 1