Finding the Third Proportional to 328,616 and 672,804

Step by Step Solution

1. Step 1: Write the proportion equation
   328,616 : 672,804 = 672,804 : x
2. Step 2: Convert to fraction form
   328,616/672,804 = 672,804/x
3. Step 3: Cross multiply
   328,616x = 672,804 × 672,804
4. Step 4: Simplify right side
   328,616x = 452,665,222,416
5. Step 5: Solve for x
   x = 452,665,222,416/328,616
6. Step 6: Final answer
   x = 1,377,489.90