Finding the Third Proportional to 443,357 and 687,907

Step by Step Solution

1. Step 1: Write the proportion equation
   443,357 : 687,907 = 687,907 : x
2. Step 2: Convert to fraction form
   443,357/687,907 = 687,907/x
3. Step 3: Cross multiply
   443,357x = 687,907 × 687,907
4. Step 4: Simplify right side
   443,357x = 473,216,040,649
5. Step 5: Solve for x
   x = 473,216,040,649/443,357
6. Step 6: Final answer
   x = 1,067,347.62