Finding the Third Proportional to 642,406.50 and 1,428,435

Step by Step Solution

1. Step 1: Write the proportion equation
   642,406.50 : 1,428,435 = 1,428,435 : x
2. Step 2: Convert to fraction form
   642,406.50/1,428,435 = 1,428,435/x
3. Step 3: Cross multiply
   642,406.50x = 1,428,435 × 1,428,435
4. Step 4: Simplify right side
   642,406.50x = 2,040,426,549,225
5. Step 5: Solve for x
   x = 2,040,426,549,225/642,406.50
6. Step 6: Final answer
   x = 3,176,223.39