Finding the Third Proportional to 297,078.50 and 641,507

Step by Step Solution

1. Step 1: Write the proportion equation
   297,078.50 : 641,507 = 641,507 : x
2. Step 2: Convert to fraction form
   297,078.50/641,507 = 641,507/x
3. Step 3: Cross multiply
   297,078.50x = 641,507 × 641,507
4. Step 4: Simplify right side
   297,078.50x = 411,531,231,049
5. Step 5: Solve for x
   x = 411,531,231,049/297,078.50
6. Step 6: Final answer
   x = 1,385,260.90