Finding the Fourth Proportional to 111.38, 167.13 and 105.30

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 167.13 = 105.30 : x
2. Step 2: Convert to fraction form
   111.38/167.13 = 105.30/x
3. Step 3: Cross multiply
   111.38x = 167.13 × 105.30
4. Step 4: Simplify right side
   111.38x = 17,598.79
5. Step 5: Solve for x
   x = 17,598.79/111.38
6. Step 6: Final answer
   x = 158.01