Finding the Third Proportional to 5.18 and 10.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5.18 : 10.89 = 10.89 : x
2. Step 2: Convert to fraction form
   5.18/10.89 = 10.89/x
3. Step 3: Cross multiply
   5.18x = 10.89 × 10.89
4. Step 4: Simplify right side
   5.18x = 118.50
5. Step 5: Solve for x
   x = 118.50/5.18
6. Step 6: Final answer
   x = 22.88