Finding the Third Proportional to 1,215,678 and 2,645,412

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,678 : 2,645,412 = 2,645,412 : x
2. Step 2: Convert to fraction form
   1,215,678/2,645,412 = 2,645,412/x
3. Step 3: Cross multiply
   1,215,678x = 2,645,412 × 2,645,412
4. Step 4: Simplify right side
   1,215,678x = 6,998,204,649,744
5. Step 5: Solve for x
   x = 6,998,204,649,744/1,215,678
6. Step 6: Final answer
   x = 5,756,626.88