Finding the Fourth Proportional to 111.10, 153.28 and 81.59

Step by Step Solution

1. Step 1: Write the proportion equation
   111.10 : 153.28 = 81.59 : x
2. Step 2: Convert to fraction form
   111.10/153.28 = 81.59/x
3. Step 3: Cross multiply
   111.10x = 153.28 × 81.59
4. Step 4: Simplify right side
   111.10x = 12,506.84
5. Step 5: Solve for x
   x = 12,506.84/111.10
6. Step 6: Final answer
   x = 112.58