Finding the Third Proportional to 198,486 and 259,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   198,486 : 259,591.50 = 259,591.50 : x
2. Step 2: Convert to fraction form
   198,486/259,591.50 = 259,591.50/x
3. Step 3: Cross multiply
   198,486x = 259,591.50 × 259,591.50
4. Step 4: Simplify right side
   198,486x = 67,387,746,872.25
5. Step 5: Solve for x
   x = 67,387,746,872.25/198,486
6. Step 6: Final answer
   x = 339,508.82