Finding the Third Proportional to 647,431 and 1,320,563

Step by Step Solution

1. Step 1: Write the proportion equation
   647,431 : 1,320,563 = 1,320,563 : x
2. Step 2: Convert to fraction form
   647,431/1,320,563 = 1,320,563/x
3. Step 3: Cross multiply
   647,431x = 1,320,563 × 1,320,563
4. Step 4: Simplify right side
   647,431x = 1,743,886,636,969
5. Step 5: Solve for x
   x = 1,743,886,636,969/647,431
6. Step 6: Final answer
   x = 2,693,548.25