Finding the Fourth Proportional to 111.42, 166.29 and 109.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 166.29 = 109.62 : x
2. Step 2: Convert to fraction form
   111.42/166.29 = 109.62/x
3. Step 3: Cross multiply
   111.42x = 166.29 × 109.62
4. Step 4: Simplify right side
   111.42x = 18,228.71
5. Step 5: Solve for x
   x = 18,228.71/111.42
6. Step 6: Final answer
   x = 163.60