Finding the Third Proportional to 328,645 and 707,105

Step by Step Solution

1. Step 1: Write the proportion equation
   328,645 : 707,105 = 707,105 : x
2. Step 2: Convert to fraction form
   328,645/707,105 = 707,105/x
3. Step 3: Cross multiply
   328,645x = 707,105 × 707,105
4. Step 4: Simplify right side
   328,645x = 499,997,481,025
5. Step 5: Solve for x
   x = 499,997,481,025/328,645
6. Step 6: Final answer
   x = 1,521,390.80