Finding the Third Proportional to 668,868 and 1,428,456

Step by Step Solution

1. Step 1: Write the proportion equation
   668,868 : 1,428,456 = 1,428,456 : x
2. Step 2: Convert to fraction form
   668,868/1,428,456 = 1,428,456/x
3. Step 3: Cross multiply
   668,868x = 1,428,456 × 1,428,456
4. Step 4: Simplify right side
   668,868x = 2,040,486,543,936
5. Step 5: Solve for x
   x = 2,040,486,543,936/668,868
6. Step 6: Final answer
   x = 3,050,656.55