Finding the Fourth Proportional to 42.82, 58.99 and 28.24

Step by Step Solution

1. Step 1: Write the proportion equation
   42.82 : 58.99 = 28.24 : x
2. Step 2: Convert to fraction form
   42.82/58.99 = 28.24/x
3. Step 3: Cross multiply
   42.82x = 58.99 × 28.24
4. Step 4: Simplify right side
   42.82x = 1,665.88
5. Step 5: Solve for x
   x = 1,665.88/42.82
6. Step 6: Final answer
   x = 38.90