Finding the Third Proportional to 328,784 and 718,439.50

Step by Step Solution

1. Step 1: Write the proportion equation
   328,784 : 718,439.50 = 718,439.50 : x
2. Step 2: Convert to fraction form
   328,784/718,439.50 = 718,439.50/x
3. Step 3: Cross multiply
   328,784x = 718,439.50 × 718,439.50
4. Step 4: Simplify right side
   328,784x = 516,155,315,160.25
5. Step 5: Solve for x
   x = 516,155,315,160.25/328,784
6. Step 6: Final answer
   x = 1,569,891.83