Finding the Fourth Proportional to 111.83, 166.91 and 98.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.83 : 166.91 = 98.15 : x
2. Step 2: Convert to fraction form
   111.83/166.91 = 98.15/x
3. Step 3: Cross multiply
   111.83x = 166.91 × 98.15
4. Step 4: Simplify right side
   111.83x = 16,380.89
5. Step 5: Solve for x
   x = 16,380.89/111.83
6. Step 6: Final answer
   x = 146.49