Finding the Third Proportional to 1,287,679 and 2,681,330

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287,679 : 2,681,330 = 2,681,330 : x
2. Step 2: Convert to fraction form
   1,287,679/2,681,330 = 2,681,330/x
3. Step 3: Cross multiply
   1,287,679x = 2,681,330 × 2,681,330
4. Step 4: Simplify right side
   1,287,679x = 7,189,530,568,900
5. Step 5: Solve for x
   x = 7,189,530,568,900/1,287,679
6. Step 6: Final answer
   x = 5,583,325.17