Finding the Third Proportional to 4.90 and 10.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4.90 : 10.72 = 10.72 : x
2. Step 2: Convert to fraction form
   4.90/10.72 = 10.72/x
3. Step 3: Cross multiply
   4.90x = 10.72 × 10.72
4. Step 4: Simplify right side
   4.90x = 114.88
5. Step 5: Solve for x
   x = 114.88/4.90
6. Step 6: Final answer
   x = 23.42