Finding the Fourth Proportional to 16.69, 24.89 and 15.61

Step by Step Solution

1. Step 1: Write the proportion equation
   16.69 : 24.89 = 15.61 : x
2. Step 2: Convert to fraction form
   16.69/24.89 = 15.61/x
3. Step 3: Cross multiply
   16.69x = 24.89 × 15.61
4. Step 4: Simplify right side
   16.69x = 388.53
5. Step 5: Solve for x
   x = 388.53/16.69
6. Step 6: Final answer
   x = 23.28