Step 1:
The first step to converting 1212656431.6394 to a fraction is to re-write 1212656431.6394 in the form p/q where p and q are both positive integers. To start with, 1212656431.6394 can be written as simply 1212656431.6394/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 1212656431.6394, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 1212656431.6394/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 1212656431.6394/1 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 1212656431.6394 as a fraction:
1212656431/1 / 1