Finding the Third Proportional to 5,509,894 and 8,687,418

Step by Step Solution

1. Step 1: Write the proportion equation
   5,509,894 : 8,687,418 = 8,687,418 : x
2. Step 2: Convert to fraction form
   5,509,894/8,687,418 = 8,687,418/x
3. Step 3: Cross multiply
   5,509,894x = 8,687,418 × 8,687,418
4. Step 4: Simplify right side
   5,509,894x = 75,471,231,506,724
5. Step 5: Solve for x
   x = 75,471,231,506,724/5,509,894
6. Step 6: Final answer
   x = 13,697,401.71