Finding the Fourth Proportional to 57.42, 86.01 and 42.28

Step by Step Solution

1. Step 1: Write the proportion equation
   57.42 : 86.01 = 42.28 : x
2. Step 2: Convert to fraction form
   57.42/86.01 = 42.28/x
3. Step 3: Cross multiply
   57.42x = 86.01 × 42.28
4. Step 4: Simplify right side
   57.42x = 3,636.50
5. Step 5: Solve for x
   x = 3,636.50/57.42
6. Step 6: Final answer
   x = 63.33