Finding the Third Proportional to 315,792 and 690,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,792 : 690,643.50 = 690,643.50 : x
2. Step 2: Convert to fraction form
   315,792/690,643.50 = 690,643.50/x
3. Step 3: Cross multiply
   315,792x = 690,643.50 × 690,643.50
4. Step 4: Simplify right side
   315,792x = 476,988,444,092.25
5. Step 5: Solve for x
   x = 476,988,444,092.25/315,792
6. Step 6: Final answer
   x = 1,510,451.32