Finding the Third Proportional to 642,499.50 and 1,428,612

Step by Step Solution

1. Step 1: Write the proportion equation
   642,499.50 : 1,428,612 = 1,428,612 : x
2. Step 2: Convert to fraction form
   642,499.50/1,428,612 = 1,428,612/x
3. Step 3: Cross multiply
   642,499.50x = 1,428,612 × 1,428,612
4. Step 4: Simplify right side
   642,499.50x = 2,040,932,246,544
5. Step 5: Solve for x
   x = 2,040,932,246,544/642,499.50
6. Step 6: Final answer
   x = 3,176,550.72