Finding the Fourth Proportional to 111.21, 166.69 and 88.18

Step by Step Solution

1. Step 1: Write the proportion equation
   111.21 : 166.69 = 88.18 : x
2. Step 2: Convert to fraction form
   111.21/166.69 = 88.18/x
3. Step 3: Cross multiply
   111.21x = 166.69 × 88.18
4. Step 4: Simplify right side
   111.21x = 14,698.72
5. Step 5: Solve for x
   x = 14,698.72/111.21
6. Step 6: Final answer
   x = 132.17