Finding the Fourth Proportional to 113.16, 168.72 and 111.96

Step by Step Solution

1. Step 1: Write the proportion equation
   113.16 : 168.72 = 111.96 : x
2. Step 2: Convert to fraction form
   113.16/168.72 = 111.96/x
3. Step 3: Cross multiply
   113.16x = 168.72 × 111.96
4. Step 4: Simplify right side
   113.16x = 18,889.89
5. Step 5: Solve for x
   x = 18,889.89/113.16
6. Step 6: Final answer
   x = 166.93