Finding the Third Proportional to 5,134.50 and 10,408.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,134.50 : 10,408.50 = 10,408.50 : x
2. Step 2: Convert to fraction form
   5,134.50/10,408.50 = 10,408.50/x
3. Step 3: Cross multiply
   5,134.50x = 10,408.50 × 10,408.50
4. Step 4: Simplify right side
   5,134.50x = 108,336,872.25
5. Step 5: Solve for x
   x = 108,336,872.25/5,134.50
6. Step 6: Final answer
   x = 21,099.79