Finding the Fourth Proportional to 111.91, 167.50 and 60.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.91 : 167.50 = 60.42 : x
2. Step 2: Convert to fraction form
   111.91/167.50 = 60.42/x
3. Step 3: Cross multiply
   111.91x = 167.50 × 60.42
4. Step 4: Simplify right side
   111.91x = 10,120.35
5. Step 5: Solve for x
   x = 10,120.35/111.91
6. Step 6: Final answer
   x = 90.43