Finding the Fourth Proportional to 111.52, 166.49 and 105.28

Step by Step Solution

1. Step 1: Write the proportion equation
   111.52 : 166.49 = 105.28 : x
2. Step 2: Convert to fraction form
   111.52/166.49 = 105.28/x
3. Step 3: Cross multiply
   111.52x = 166.49 × 105.28
4. Step 4: Simplify right side
   111.52x = 17,528.07
5. Step 5: Solve for x
   x = 17,528.07/111.52
6. Step 6: Final answer
   x = 157.17