Finding the Fourth Proportional to 144.29, 198.89 and 100.55

Step by Step Solution

1. Step 1: Write the proportion equation
   144.29 : 198.89 = 100.55 : x
2. Step 2: Convert to fraction form
   144.29/198.89 = 100.55/x
3. Step 3: Cross multiply
   144.29x = 198.89 × 100.55
4. Step 4: Simplify right side
   144.29x = 19,997.89
5. Step 5: Solve for x
   x = 19,997.89/144.29
6. Step 6: Final answer
   x = 138.60