Finding the Fourth Proportional to 111.60, 153.86 and 109.28

Step by Step Solution

1. Step 1: Write the proportion equation
   111.60 : 153.86 = 109.28 : x
2. Step 2: Convert to fraction form
   111.60/153.86 = 109.28/x
3. Step 3: Cross multiply
   111.60x = 153.86 × 109.28
4. Step 4: Simplify right side
   111.60x = 16,813.82
5. Step 5: Solve for x
   x = 16,813.82/111.60
6. Step 6: Final answer
   x = 150.66