Step 1:
The first step to converting 396551871.66078 to a fraction is to re-write 396551871.66078 in the form p/q where p and q are both positive integers. To start with, 396551871.66078 can be written as simply 396551871.66078/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 396551871.66078, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 396551871.66078/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 396551871.66078/1 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 396551871.66078 as a fraction:
396551871/1 / 1