Finding the Third Proportional to 690,843,308 and 987,914,055

Step by Step Solution

1. Step 1: Write the proportion equation
   690,843,308 : 987,914,055 = 987,914,055 : x
2. Step 2: Convert to fraction form
   690,843,308/987,914,055 = 987,914,055/x
3. Step 3: Cross multiply
   690,843,308x = 987,914,055 × 987,914,055
4. Step 4: Simplify right side
   690,843,308x = 975,974,180,066,542,976
5. Step 5: Solve for x
   x = 975,974,180,066,542,976/690,843,308
6. Step 6: Final answer
   x = 1,412,728,716.87