Finding the Fourth Proportional to 158.38, 237.54 and 42.79

Step by Step Solution

1. Step 1: Write the proportion equation
   158.38 : 237.54 = 42.79 : x
2. Step 2: Convert to fraction form
   158.38/237.54 = 42.79/x
3. Step 3: Cross multiply
   158.38x = 237.54 × 42.79
4. Step 4: Simplify right side
   158.38x = 10,164.72
5. Step 5: Solve for x
   x = 10,164.72/158.38
6. Step 6: Final answer
   x = 64.18