Step 1:
The first step to converting 861570316.8112 to a fraction is to re-write 861570316.8112 in the form p/q where p and q are both positive integers. To start with, 861570316.8112 can be written as simply 861570316.8112/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 861570316.8112, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 861570316.8112/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 861570316.8112/1 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 861570316.8112 as a fraction:
861570316/1 / 1