Finding the Third Proportional to 642,318 and 1,399,028

Step by Step Solution

1. Step 1: Write the proportion equation
   642,318 : 1,399,028 = 1,399,028 : x
2. Step 2: Convert to fraction form
   642,318/1,399,028 = 1,399,028/x
3. Step 3: Cross multiply
   642,318x = 1,399,028 × 1,399,028
4. Step 4: Simplify right side
   642,318x = 1,957,279,344,784
5. Step 5: Solve for x
   x = 1,957,279,344,784/642,318
6. Step 6: Final answer
   x = 3,047,212.35