Finding the Fourth Proportional to 111.28, 153.76 and 105.36

Step by Step Solution

1. Step 1: Write the proportion equation
   111.28 : 153.76 = 105.36 : x
2. Step 2: Convert to fraction form
   111.28/153.76 = 105.36/x
3. Step 3: Cross multiply
   111.28x = 153.76 × 105.36
4. Step 4: Simplify right side
   111.28x = 16,200.15
5. Step 5: Solve for x
   x = 16,200.15/111.28
6. Step 6: Final answer
   x = 145.58