Finding the Fourth Proportional to 21.83, 32.71 and 11.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21.83 : 32.71 = 11.15 : x
2. Step 2: Convert to fraction form
   21.83/32.71 = 11.15/x
3. Step 3: Cross multiply
   21.83x = 32.71 × 11.15
4. Step 4: Simplify right side
   21.83x = 364.72
5. Step 5: Solve for x
   x = 364.72/21.83
6. Step 6: Final answer
   x = 16.71