Finding the Fourth Proportional to 105.12, 143.82 and 103.23

Step by Step Solution

1. Step 1: Write the proportion equation
   105.12 : 143.82 = 103.23 : x
2. Step 2: Convert to fraction form
   105.12/143.82 = 103.23/x
3. Step 3: Cross multiply
   105.12x = 143.82 × 103.23
4. Step 4: Simplify right side
   105.12x = 14,846.54
5. Step 5: Solve for x
   x = 14,846.54/105.12
6. Step 6: Final answer
   x = 141.23