Finding the Fourth Proportional to 111.12, 152.58 and 103.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.12 : 152.58 = 103.62 : x
2. Step 2: Convert to fraction form
   111.12/152.58 = 103.62/x
3. Step 3: Cross multiply
   111.12x = 152.58 × 103.62
4. Step 4: Simplify right side
   111.12x = 15,810.34
5. Step 5: Solve for x
   x = 15,810.34/111.12
6. Step 6: Final answer
   x = 142.28