Finding the Fourth Proportional to 42.42, 58.62 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42.42 : 58.62 = 42.18 : x
2. Step 2: Convert to fraction form
   42.42/58.62 = 42.18/x
3. Step 3: Cross multiply
   42.42x = 58.62 × 42.18
4. Step 4: Simplify right side
   42.42x = 2,472.59
5. Step 5: Solve for x
   x = 2,472.59/42.42
6. Step 6: Final answer
   x = 58.29