Finding the Fourth Proportional to 111.50, 166.26 and 105.11

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 166.26 = 105.11 : x
2. Step 2: Convert to fraction form
   111.50/166.26 = 105.11/x
3. Step 3: Cross multiply
   111.50x = 166.26 × 105.11
4. Step 4: Simplify right side
   111.50x = 17,475.59
5. Step 5: Solve for x
   x = 17,475.59/111.50
6. Step 6: Final answer
   x = 156.73