Step 1:
The first step to converting 161915.21785163 to a fraction is to re-write 161915.21785163 in the form p/q where p and q are both positive integers. To start with, 161915.21785163 can be written as simply 161915.21785163/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 161915.21785163, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 161915.21785163/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 161915.21785163/1 each by 100000000:
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 161915.21785163 as a fraction:
647661/4 / 1