Finding the Fourth Proportional to 111.59, 153.85 and 109.29

Step by Step Solution

1. Step 1: Write the proportion equation
   111.59 : 153.85 = 109.29 : x
2. Step 2: Convert to fraction form
   111.59/153.85 = 109.29/x
3. Step 3: Cross multiply
   111.59x = 153.85 × 109.29
4. Step 4: Simplify right side
   111.59x = 16,814.27
5. Step 5: Solve for x
   x = 16,814.27/111.59
6. Step 6: Final answer
   x = 150.68