Finding the Third Proportional to 398,866 and 598,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   398,866 : 598,591.50 = 598,591.50 : x
2. Step 2: Convert to fraction form
   398,866/598,591.50 = 598,591.50/x
3. Step 3: Cross multiply
   398,866x = 598,591.50 × 598,591.50
4. Step 4: Simplify right side
   398,866x = 358,311,783,872.25
5. Step 5: Solve for x
   x = 358,311,783,872.25/398,866
6. Step 6: Final answer
   x = 898,326.21