Finding the Fourth Proportional to 105.72, 158.50 and 47.98

Step by Step Solution

1. Step 1: Write the proportion equation
   105.72 : 158.50 = 47.98 : x
2. Step 2: Convert to fraction form
   105.72/158.50 = 47.98/x
3. Step 3: Cross multiply
   105.72x = 158.50 × 47.98
4. Step 4: Simplify right side
   105.72x = 7,604.83
5. Step 5: Solve for x
   x = 7,604.83/105.72
6. Step 6: Final answer
   x = 71.93