Finding the Fourth Proportional to 104.96, 144.82 and 72.20

Step by Step Solution

1. Step 1: Write the proportion equation
   104.96 : 144.82 = 72.20 : x
2. Step 2: Convert to fraction form
   104.96/144.82 = 72.20/x
3. Step 3: Cross multiply
   104.96x = 144.82 × 72.20
4. Step 4: Simplify right side
   104.96x = 10,456.00
5. Step 5: Solve for x
   x = 10,456.00/104.96
6. Step 6: Final answer
   x = 99.62