Finding the Fourth Proportional to 111.16, 153.25 and 106.71

Step by Step Solution

1. Step 1: Write the proportion equation
   111.16 : 153.25 = 106.71 : x
2. Step 2: Convert to fraction form
   111.16/153.25 = 106.71/x
3. Step 3: Cross multiply
   111.16x = 153.25 × 106.71
4. Step 4: Simplify right side
   111.16x = 16,353.31
5. Step 5: Solve for x
   x = 16,353.31/111.16
6. Step 6: Final answer
   x = 147.12