Finding the Third Proportional to 315,083.50 and 691,398

Step by Step Solution

1. Step 1: Write the proportion equation
   315,083.50 : 691,398 = 691,398 : x
2. Step 2: Convert to fraction form
   315,083.50/691,398 = 691,398/x
3. Step 3: Cross multiply
   315,083.50x = 691,398 × 691,398
4. Step 4: Simplify right side
   315,083.50x = 478,031,194,404
5. Step 5: Solve for x
   x = 478,031,194,404/315,083.50
6. Step 6: Final answer
   x = 1,517,157.18