Finding the Fourth Proportional to 16.56, 24.72 and 13.86

Step by Step Solution

1. Step 1: Write the proportion equation
   16.56 : 24.72 = 13.86 : x
2. Step 2: Convert to fraction form
   16.56/24.72 = 13.86/x
3. Step 3: Cross multiply
   16.56x = 24.72 × 13.86
4. Step 4: Simplify right side
   16.56x = 342.62
5. Step 5: Solve for x
   x = 342.62/16.56
6. Step 6: Final answer
   x = 20.69