Finding the Third Proportional to 647,498 and 1,320,688

Step by Step Solution

1. Step 1: Write the proportion equation
   647,498 : 1,320,688 = 1,320,688 : x
2. Step 2: Convert to fraction form
   647,498/1,320,688 = 1,320,688/x
3. Step 3: Cross multiply
   647,498x = 1,320,688 × 1,320,688
4. Step 4: Simplify right side
   647,498x = 1,744,216,793,344
5. Step 5: Solve for x
   x = 1,744,216,793,344/647,498
6. Step 6: Final answer
   x = 2,693,779.43