Finding the Fourth Proportional to 42.29, 58.34 and 28.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.29 : 58.34 = 28.31 : x
2. Step 2: Convert to fraction form
   42.29/58.34 = 28.31/x
3. Step 3: Cross multiply
   42.29x = 58.34 × 28.31
4. Step 4: Simplify right side
   42.29x = 1,651.31
5. Step 5: Solve for x
   x = 1,651.31/42.29
6. Step 6: Final answer
   x = 39.05