Step 1:
The first step to converting 161331.78401559 to a fraction is to re-write 161331.78401559 in the form p/q where p and q are both positive integers. To start with, 161331.78401559 can be written as simply 161331.78401559/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 161331.78401559, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 161331.78401559/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 161331.78401559/1 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 161331.78401559 as a fraction:
645327/4 / 1