Finding the Fourth Proportional to 113.40, 168.89 and 111.98

Step by Step Solution

1. Step 1: Write the proportion equation
   113.40 : 168.89 = 111.98 : x
2. Step 2: Convert to fraction form
   113.40/168.89 = 111.98/x
3. Step 3: Cross multiply
   113.40x = 168.89 × 111.98
4. Step 4: Simplify right side
   113.40x = 18,912.16
5. Step 5: Solve for x
   x = 18,912.16/113.40
6. Step 6: Final answer
   x = 166.77