Finding the Fourth Proportional to 111.69, 153.99 and 82.08

Step by Step Solution

1. Step 1: Write the proportion equation
   111.69 : 153.99 = 82.08 : x
2. Step 2: Convert to fraction form
   111.69/153.99 = 82.08/x
3. Step 3: Cross multiply
   111.69x = 153.99 × 82.08
4. Step 4: Simplify right side
   111.69x = 12,639.50
5. Step 5: Solve for x
   x = 12,639.50/111.69
6. Step 6: Final answer
   x = 113.17