Finding the Fourth Proportional to 105.50, 158.25 and 47.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105.50 : 158.25 = 47.72 : x
2. Step 2: Convert to fraction form
   105.50/158.25 = 47.72/x
3. Step 3: Cross multiply
   105.50x = 158.25 × 47.72
4. Step 4: Simplify right side
   105.50x = 7,550.90
5. Step 5: Solve for x
   x = 7,550.90/105.50
6. Step 6: Final answer
   x = 71.58