Finding the Fourth Proportional to 144.50, 199.35 and 100.89

Step by Step Solution

1. Step 1: Write the proportion equation
   144.50 : 199.35 = 100.89 : x
2. Step 2: Convert to fraction form
   144.50/199.35 = 100.89/x
3. Step 3: Cross multiply
   144.50x = 199.35 × 100.89
4. Step 4: Simplify right side
   144.50x = 20,112.42
5. Step 5: Solve for x
   x = 20,112.42/144.50
6. Step 6: Final answer
   x = 139.19