Finding the Fourth Proportional to 144.25, 199.20 and 100.71

Step by Step Solution

1. Step 1: Write the proportion equation
   144.25 : 199.20 = 100.71 : x
2. Step 2: Convert to fraction form
   144.25/199.20 = 100.71/x
3. Step 3: Cross multiply
   144.25x = 199.20 × 100.71
4. Step 4: Simplify right side
   144.25x = 20,061.43
5. Step 5: Solve for x
   x = 20,061.43/144.25
6. Step 6: Final answer
   x = 139.07