Finding the Third Proportional to 642,942 and 1,400,172

Step by Step Solution

1. Step 1: Write the proportion equation
   642,942 : 1,400,172 = 1,400,172 : x
2. Step 2: Convert to fraction form
   642,942/1,400,172 = 1,400,172/x
3. Step 3: Cross multiply
   642,942x = 1,400,172 × 1,400,172
4. Step 4: Simplify right side
   642,942x = 1,960,481,629,584
5. Step 5: Solve for x
   x = 1,960,481,629,584/642,942
6. Step 6: Final answer
   x = 3,049,235.59