Finding the Fourth Proportional to 111.52, 167.51 and 105.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.52 : 167.51 = 105.15 : x
2. Step 2: Convert to fraction form
   111.52/167.51 = 105.15/x
3. Step 3: Cross multiply
   111.52x = 167.51 × 105.15
4. Step 4: Simplify right side
   111.52x = 17,613.68
5. Step 5: Solve for x
   x = 17,613.68/111.52
6. Step 6: Final answer
   x = 157.94