Finding the Fourth Proportional to 111.56, 153.50 and 108.86

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 153.50 = 108.86 : x
2. Step 2: Convert to fraction form
   111.56/153.50 = 108.86/x
3. Step 3: Cross multiply
   111.56x = 153.50 × 108.86
4. Step 4: Simplify right side
   111.56x = 16,708.70
5. Step 5: Solve for x
   x = 16,708.70/111.56
6. Step 6: Final answer
   x = 149.78