Finding the Fourth Proportional to 105.42, 158.15 and 43.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105.42 : 158.15 = 43.72 : x
2. Step 2: Convert to fraction form
   105.42/158.15 = 43.72/x
3. Step 3: Cross multiply
   105.42x = 158.15 × 43.72
4. Step 4: Simplify right side
   105.42x = 6,914.03
5. Step 5: Solve for x
   x = 6,914.03/105.42
6. Step 6: Final answer
   x = 65.58