Step 1:
The first step to converting 1189196378.8621 to a fraction is to re-write 1189196378.8621 in the form p/q where p and q are both positive integers. To start with, 1189196378.8621 can be written as simply 1189196378.8621/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 1189196378.8621, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 1189196378.8621/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 1189196378.8621/1 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 1189196378.8621 as a fraction:
1189196378/1 / 1