Finding the Third Proportional to 686,512 and 1,420,760

Step by Step Solution

1. Step 1: Write the proportion equation
   686,512 : 1,420,760 = 1,420,760 : x
2. Step 2: Convert to fraction form
   686,512/1,420,760 = 1,420,760/x
3. Step 3: Cross multiply
   686,512x = 1,420,760 × 1,420,760
4. Step 4: Simplify right side
   686,512x = 2,018,558,977,600
5. Step 5: Solve for x
   x = 2,018,558,977,600/686,512
6. Step 6: Final answer
   x = 2,940,311.28