Finding the Fourth Proportional to 111.10, 165.71 and 103.54

Step by Step Solution

1. Step 1: Write the proportion equation
   111.10 : 165.71 = 103.54 : x
2. Step 2: Convert to fraction form
   111.10/165.71 = 103.54/x
3. Step 3: Cross multiply
   111.10x = 165.71 × 103.54
4. Step 4: Simplify right side
   111.10x = 17,157.61
5. Step 5: Solve for x
   x = 17,157.61/111.10
6. Step 6: Final answer
   x = 154.43