Finding the Fourth Proportional to 104.93, 144.71 and 72.17

Step by Step Solution

1. Step 1: Write the proportion equation
   104.93 : 144.71 = 72.17 : x
2. Step 2: Convert to fraction form
   104.93/144.71 = 72.17/x
3. Step 3: Cross multiply
   104.93x = 144.71 × 72.17
4. Step 4: Simplify right side
   104.93x = 10,442.64
5. Step 5: Solve for x
   x = 10,442.64/104.93
6. Step 6: Final answer
   x = 99.52