Finding the Fourth Proportional to 16.51, 24.72 and 13.50

Step by Step Solution

1. Step 1: Write the proportion equation
   16.51 : 24.72 = 13.50 : x
2. Step 2: Convert to fraction form
   16.51/24.72 = 13.50/x
3. Step 3: Cross multiply
   16.51x = 24.72 × 13.50
4. Step 4: Simplify right side
   16.51x = 333.72
5. Step 5: Solve for x
   x = 333.72/16.51
6. Step 6: Final answer
   x = 20.21