Finding the Fourth Proportional to 111.16, 166.31 and 98.18

Step by Step Solution

1. Step 1: Write the proportion equation
   111.16 : 166.31 = 98.18 : x
2. Step 2: Convert to fraction form
   111.16/166.31 = 98.18/x
3. Step 3: Cross multiply
   111.16x = 166.31 × 98.18
4. Step 4: Simplify right side
   111.16x = 16,327.72
5. Step 5: Solve for x
   x = 16,327.72/111.16
6. Step 6: Final answer
   x = 146.88