Step 1:
The first step to converting 420805963.6516 to a fraction is to re-write 420805963.6516 in the form p/q where p and q are both positive integers. To start with, 420805963.6516 can be written as simply 420805963.6516/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 420805963.6516, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 420805963.6516/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 420805963.6516/1 each by 10000:
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 420805963.6516 as a fraction:
420805963/1 / 1