Finding the Fourth Proportional to 111.88, 167.89 and 103.11

Step by Step Solution

1. Step 1: Write the proportion equation
   111.88 : 167.89 = 103.11 : x
2. Step 2: Convert to fraction form
   111.88/167.89 = 103.11/x
3. Step 3: Cross multiply
   111.88x = 167.89 × 103.11
4. Step 4: Simplify right side
   111.88x = 17,311.14
5. Step 5: Solve for x
   x = 17,311.14/111.88
6. Step 6: Final answer
   x = 154.73