Finding the Fourth Proportional to 105.72, 158.56 and 33.57

Step by Step Solution

1. Step 1: Write the proportion equation
   105.72 : 158.56 = 33.57 : x
2. Step 2: Convert to fraction form
   105.72/158.56 = 33.57/x
3. Step 3: Cross multiply
   105.72x = 158.56 × 33.57
4. Step 4: Simplify right side
   105.72x = 5,323.31
5. Step 5: Solve for x
   x = 5,323.31/105.72
6. Step 6: Final answer
   x = 50.35