Finding the Third Proportional to 647,478 and 1,320,636

Step by Step Solution

1. Step 1: Write the proportion equation
   647,478 : 1,320,636 = 1,320,636 : x
2. Step 2: Convert to fraction form
   647,478/1,320,636 = 1,320,636/x
3. Step 3: Cross multiply
   647,478x = 1,320,636 × 1,320,636
4. Step 4: Simplify right side
   647,478x = 1,744,079,444,496
5. Step 5: Solve for x
   x = 1,744,079,444,496/647,478
6. Step 6: Final answer
   x = 2,693,650.51