Finding the Fourth Proportional to 111.96, 154.76 and 83.12

Step by Step Solution

1. Step 1: Write the proportion equation
   111.96 : 154.76 = 83.12 : x
2. Step 2: Convert to fraction form
   111.96/154.76 = 83.12/x
3. Step 3: Cross multiply
   111.96x = 154.76 × 83.12
4. Step 4: Simplify right side
   111.96x = 12,863.65
5. Step 5: Solve for x
   x = 12,863.65/111.96
6. Step 6: Final answer
   x = 114.90