Finding the Third Proportional to 309,876 and 667,183.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,876 : 667,183.50 = 667,183.50 : x
2. Step 2: Convert to fraction form
   309,876/667,183.50 = 667,183.50/x
3. Step 3: Cross multiply
   309,876x = 667,183.50 × 667,183.50
4. Step 4: Simplify right side
   309,876x = 445,133,822,672.25
5. Step 5: Solve for x
   x = 445,133,822,672.25/309,876
6. Step 6: Final answer
   x = 1,436,490.15