Finding the Fourth Proportional to 28.52, 42.82 and 18.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28.52 : 42.82 = 18.42 : x
2. Step 2: Convert to fraction form
   28.52/42.82 = 18.42/x
3. Step 3: Cross multiply
   28.52x = 42.82 × 18.42
4. Step 4: Simplify right side
   28.52x = 788.74
5. Step 5: Solve for x
   x = 788.74/28.52
6. Step 6: Final answer
   x = 27.66