Finding the Third Proportional to 315,148.50 and 691,524

Step by Step Solution

1. Step 1: Write the proportion equation
   315,148.50 : 691,524 = 691,524 : x
2. Step 2: Convert to fraction form
   315,148.50/691,524 = 691,524/x
3. Step 3: Cross multiply
   315,148.50x = 691,524 × 691,524
4. Step 4: Simplify right side
   315,148.50x = 478,205,442,576
5. Step 5: Solve for x
   x = 478,205,442,576/315,148.50
6. Step 6: Final answer
   x = 1,517,397.17