Finding the Fourth Proportional to 42.72, 58.40 and 42.24

Step by Step Solution

1. Step 1: Write the proportion equation
   42.72 : 58.40 = 42.24 : x
2. Step 2: Convert to fraction form
   42.72/58.40 = 42.24/x
3. Step 3: Cross multiply
   42.72x = 58.40 × 42.24
4. Step 4: Simplify right side
   42.72x = 2,466.82
5. Step 5: Solve for x
   x = 2,466.82/42.72
6. Step 6: Final answer
   x = 57.74