Finding the Fourth Proportional to 111.58, 166.54 and 109.69

Step by Step Solution

1. Step 1: Write the proportion equation
   111.58 : 166.54 = 109.69 : x
2. Step 2: Convert to fraction form
   111.58/166.54 = 109.69/x
3. Step 3: Cross multiply
   111.58x = 166.54 × 109.69
4. Step 4: Simplify right side
   111.58x = 18,267.77
5. Step 5: Solve for x
   x = 18,267.77/111.58
6. Step 6: Final answer
   x = 163.72