Finding the Fourth Proportional to 42.18, 63.33 and 38.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42.18 : 63.33 = 38.58 : x
2. Step 2: Convert to fraction form
   42.18/63.33 = 38.58/x
3. Step 3: Cross multiply
   42.18x = 63.33 × 38.58
4. Step 4: Simplify right side
   42.18x = 2,443.27
5. Step 5: Solve for x
   x = 2,443.27/42.18
6. Step 6: Final answer
   x = 57.92