Finding the Fourth Proportional to 42.48, 57.60 and 42.24

Step by Step Solution

1. Step 1: Write the proportion equation
   42.48 : 57.60 = 42.24 : x
2. Step 2: Convert to fraction form
   42.48/57.60 = 42.24/x
3. Step 3: Cross multiply
   42.48x = 57.60 × 42.24
4. Step 4: Simplify right side
   42.48x = 2,433.02
5. Step 5: Solve for x
   x = 2,433.02/42.48
6. Step 6: Final answer
   x = 57.27