Finding the Third Proportional to 1,215,243 and 2,659,311

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,243 : 2,659,311 = 2,659,311 : x
2. Step 2: Convert to fraction form
   1,215,243/2,659,311 = 2,659,311/x
3. Step 3: Cross multiply
   1,215,243x = 2,659,311 × 2,659,311
4. Step 4: Simplify right side
   1,215,243x = 7,071,934,994,721
5. Step 5: Solve for x
   x = 7,071,934,994,721/1,215,243
6. Step 6: Final answer
   x = 5,819,358.76