Finding the Fourth Proportional to 57.10, 78.81 and 42.38

Step by Step Solution

1. Step 1: Write the proportion equation
   57.10 : 78.81 = 42.38 : x
2. Step 2: Convert to fraction form
   57.10/78.81 = 42.38/x
3. Step 3: Cross multiply
   57.10x = 78.81 × 42.38
4. Step 4: Simplify right side
   57.10x = 3,339.76
5. Step 5: Solve for x
   x = 3,339.76/57.10
6. Step 6: Final answer
   x = 58.49