Finding the Third Proportional to 297,676.69 and 643,099.50

Step by Step Solution

1. Step 1: Write the proportion equation
   297,676.69 : 643,099.50 = 643,099.50 : x
2. Step 2: Convert to fraction form
   297,676.69/643,099.50 = 643,099.50/x
3. Step 3: Cross multiply
   297,676.69x = 643,099.50 × 643,099.50
4. Step 4: Simplify right side
   297,676.69x = 413,576,966,900.25
5. Step 5: Solve for x
   x = 413,576,966,900.25/297,676.69
6. Step 6: Final answer
   x = 1,389,349.53