Finding the Third Proportional to 398,940 and 598,411.50

Step by Step Solution

1. Step 1: Write the proportion equation
   398,940 : 598,411.50 = 598,411.50 : x
2. Step 2: Convert to fraction form
   398,940/598,411.50 = 598,411.50/x
3. Step 3: Cross multiply
   398,940x = 598,411.50 × 598,411.50
4. Step 4: Simplify right side
   398,940x = 358,096,323,332.25
5. Step 5: Solve for x
   x = 358,096,323,332.25/398,940
6. Step 6: Final answer
   x = 897,619.50