Finding the Third Proportional to 309,038.50 and 641,762

Step by Step Solution

1. Step 1: Write the proportion equation
   309,038.50 : 641,762 = 641,762 : x
2. Step 2: Convert to fraction form
   309,038.50/641,762 = 641,762/x
3. Step 3: Cross multiply
   309,038.50x = 641,762 × 641,762
4. Step 4: Simplify right side
   309,038.50x = 411,858,464,644
5. Step 5: Solve for x
   x = 411,858,464,644/309,038.50
6. Step 6: Final answer
   x = 1,332,709.24