Finding the Fourth Proportional to 96.72, 144.99 and 72.78

Step by Step Solution

1. Step 1: Write the proportion equation
   96.72 : 144.99 = 72.78 : x
2. Step 2: Convert to fraction form
   96.72/144.99 = 72.78/x
3. Step 3: Cross multiply
   96.72x = 144.99 × 72.78
4. Step 4: Simplify right side
   96.72x = 10,552.37
5. Step 5: Solve for x
   x = 10,552.37/96.72
6. Step 6: Final answer
   x = 109.10