Finding the Third Proportional to 315,568.50 and 684,639

Step by Step Solution

1. Step 1: Write the proportion equation
   315,568.50 : 684,639 = 684,639 : x
2. Step 2: Convert to fraction form
   315,568.50/684,639 = 684,639/x
3. Step 3: Cross multiply
   315,568.50x = 684,639 × 684,639
4. Step 4: Simplify right side
   315,568.50x = 468,730,560,321
5. Step 5: Solve for x
   x = 468,730,560,321/315,568.50
6. Step 6: Final answer
   x = 1,485,352.82