Finding the Fourth Proportional to 111.18, 153.51 and 82.14

Step by Step Solution

1. Step 1: Write the proportion equation
   111.18 : 153.51 = 82.14 : x
2. Step 2: Convert to fraction form
   111.18/153.51 = 82.14/x
3. Step 3: Cross multiply
   111.18x = 153.51 × 82.14
4. Step 4: Simplify right side
   111.18x = 12,609.31
5. Step 5: Solve for x
   x = 12,609.31/111.18
6. Step 6: Final answer
   x = 113.41