Finding the Fourth Proportional to 111.53, 153.97 and 82.00

Step by Step Solution

1. Step 1: Write the proportion equation
   111.53 : 153.97 = 82.00 : x
2. Step 2: Convert to fraction form
   111.53/153.97 = 82.00/x
3. Step 3: Cross multiply
   111.53x = 153.97 × 82.00
4. Step 4: Simplify right side
   111.53x = 12,624.77
5. Step 5: Solve for x
   x = 12,624.77/111.53
6. Step 6: Final answer
   x = 113.20