Finding the Fourth Proportional to 104.98, 144.78 and 72.24

Step by Step Solution

1. Step 1: Write the proportion equation
   104.98 : 144.78 = 72.24 : x
2. Step 2: Convert to fraction form
   104.98/144.78 = 72.24/x
3. Step 3: Cross multiply
   104.98x = 144.78 × 72.24
4. Step 4: Simplify right side
   104.98x = 10,458.91
5. Step 5: Solve for x
   x = 10,458.91/104.98
6. Step 6: Final answer
   x = 99.63