Finding the Fourth Proportional to 42.16, 62.93 and 38.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.16 : 62.93 = 38.31 : x
2. Step 2: Convert to fraction form
   42.16/62.93 = 38.31/x
3. Step 3: Cross multiply
   42.16x = 62.93 × 38.31
4. Step 4: Simplify right side
   42.16x = 2,410.85
5. Step 5: Solve for x
   x = 2,410.85/42.16
6. Step 6: Final answer
   x = 57.18