Step 1:
The first step to converting 516121214.85912 to a fraction is to re-write 516121214.85912 in the form p/q where p and q are both positive integers. To start with, 516121214.85912 can be written as simply 516121214.85912/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 516121214.85912, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 516121214.85912/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 516121214.85912/1 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 516121214.85912 as a fraction:
516121214/1 / 1