Finding the Fourth Proportional to 105.42, 144.51 and 103.58

Step by Step Solution

1. Step 1: Write the proportion equation
   105.42 : 144.51 = 103.58 : x
2. Step 2: Convert to fraction form
   105.42/144.51 = 103.58/x
3. Step 3: Cross multiply
   105.42x = 144.51 × 103.58
4. Step 4: Simplify right side
   105.42x = 14,968.35
5. Step 5: Solve for x
   x = 14,968.35/105.42
6. Step 6: Final answer
   x = 141.99