Finding the Third Proportional to 5,311.50 and 10,491

Step by Step Solution

1. Step 1: Write the proportion equation
   5,311.50 : 10,491 = 10,491 : x
2. Step 2: Convert to fraction form
   5,311.50/10,491 = 10,491/x
3. Step 3: Cross multiply
   5,311.50x = 10,491 × 10,491
4. Step 4: Simplify right side
   5,311.50x = 110,061,081
5. Step 5: Solve for x
   x = 110,061,081/5,311.50
6. Step 6: Final answer
   x = 20,721.28