Finding the Third Proportional to 442,856 and 687,612

Step by Step Solution

1. Step 1: Write the proportion equation
   442,856 : 687,612 = 687,612 : x
2. Step 2: Convert to fraction form
   442,856/687,612 = 687,612/x
3. Step 3: Cross multiply
   442,856x = 687,612 × 687,612
4. Step 4: Simplify right side
   442,856x = 472,810,262,544
5. Step 5: Solve for x
   x = 472,810,262,544/442,856
6. Step 6: Final answer
   x = 1,067,638.83