Finding the Fourth Proportional to 21.82, 32.69 and 15.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21.82 : 32.69 = 15.82 : x
2. Step 2: Convert to fraction form
   21.82/32.69 = 15.82/x
3. Step 3: Cross multiply
   21.82x = 32.69 × 15.82
4. Step 4: Simplify right side
   21.82x = 517.16
5. Step 5: Solve for x
   x = 517.16/21.82
6. Step 6: Final answer
   x = 23.70