Finding the Third Proportional to 5,515,256 and 8,239,512

Step by Step Solution

1. Step 1: Write the proportion equation
   5,515,256 : 8,239,512 = 8,239,512 : x
2. Step 2: Convert to fraction form
   5,515,256/8,239,512 = 8,239,512/x
3. Step 3: Cross multiply
   5,515,256x = 8,239,512 × 8,239,512
4. Step 4: Simplify right side
   5,515,256x = 67,889,557,998,144
5. Step 5: Solve for x
   x = 67,889,557,998,144/5,515,256
6. Step 6: Final answer
   x = 12,309,411.93