Finding the Third Proportional to 647,428 and 1,423,340

Step by Step Solution

1. Step 1: Write the proportion equation
   647,428 : 1,423,340 = 1,423,340 : x
2. Step 2: Convert to fraction form
   647,428/1,423,340 = 1,423,340/x
3. Step 3: Cross multiply
   647,428x = 1,423,340 × 1,423,340
4. Step 4: Simplify right side
   647,428x = 2,025,896,755,600
5. Step 5: Solve for x
   x = 2,025,896,755,600/647,428
6. Step 6: Final answer
   x = 3,129,146.03