Finding the Third Proportional to 442,892 and 687,670

Step by Step Solution

1. Step 1: Write the proportion equation
   442,892 : 687,670 = 687,670 : x
2. Step 2: Convert to fraction form
   442,892/687,670 = 687,670/x
3. Step 3: Cross multiply
   442,892x = 687,670 × 687,670
4. Step 4: Simplify right side
   442,892x = 472,890,028,900
5. Step 5: Solve for x
   x = 472,890,028,900/442,892
6. Step 6: Final answer
   x = 1,067,732.15