Finding the Third Proportional to 678,831 and 1,340,535

Step by Step Solution

1. Step 1: Write the proportion equation
   678,831 : 1,340,535 = 1,340,535 : x
2. Step 2: Convert to fraction form
   678,831/1,340,535 = 1,340,535/x
3. Step 3: Cross multiply
   678,831x = 1,340,535 × 1,340,535
4. Step 4: Simplify right side
   678,831x = 1,797,034,086,225
5. Step 5: Solve for x
   x = 1,797,034,086,225/678,831
6. Step 6: Final answer
   x = 2,647,248.12