Finding the Fourth Proportional to 104.72, 144.48 and 71.96

Step by Step Solution

1. Step 1: Write the proportion equation
   104.72 : 144.48 = 71.96 : x
2. Step 2: Convert to fraction form
   104.72/144.48 = 71.96/x
3. Step 3: Cross multiply
   104.72x = 144.48 × 71.96
4. Step 4: Simplify right side
   104.72x = 10,396.78
5. Step 5: Solve for x
   x = 10,396.78/104.72
6. Step 6: Final answer
   x = 99.28