Finding the Third Proportional to 315,841.50 and 690,723

Step by Step Solution

1. Step 1: Write the proportion equation
   315,841.50 : 690,723 = 690,723 : x
2. Step 2: Convert to fraction form
   315,841.50/690,723 = 690,723/x
3. Step 3: Cross multiply
   315,841.50x = 690,723 × 690,723
4. Step 4: Simplify right side
   315,841.50x = 477,098,262,729
5. Step 5: Solve for x
   x = 477,098,262,729/315,841.50
6. Step 6: Final answer
   x = 1,510,562.30