Finding the Third Proportional to 5,187,880 and 8,287,728

Step by Step Solution

1. Step 1: Write the proportion equation
   5,187,880 : 8,287,728 = 8,287,728 : x
2. Step 2: Convert to fraction form
   5,187,880/8,287,728 = 8,287,728/x
3. Step 3: Cross multiply
   5,187,880x = 8,287,728 × 8,287,728
4. Step 4: Simplify right side
   5,187,880x = 68,686,435,401,984
5. Step 5: Solve for x
   x = 68,686,435,401,984/5,187,880
6. Step 6: Final answer
   x = 13,239,788.78