Finding the Third Proportional to 645,740 and 1,317,760

Step by Step Solution

1. Step 1: Write the proportion equation
   645,740 : 1,317,760 = 1,317,760 : x
2. Step 2: Convert to fraction form
   645,740/1,317,760 = 1,317,760/x
3. Step 3: Cross multiply
   645,740x = 1,317,760 × 1,317,760
4. Step 4: Simplify right side
   645,740x = 1,736,491,417,600
5. Step 5: Solve for x
   x = 1,736,491,417,600/645,740
6. Step 6: Final answer
   x = 2,689,149.53