Finding the Fourth Proportional to 144.49, 199.39 and 78.98

Step by Step Solution

1. Step 1: Write the proportion equation
   144.49 : 199.39 = 78.98 : x
2. Step 2: Convert to fraction form
   144.49/199.39 = 78.98/x
3. Step 3: Cross multiply
   144.49x = 199.39 × 78.98
4. Step 4: Simplify right side
   144.49x = 15,748.89
5. Step 5: Solve for x
   x = 15,748.89/144.49
6. Step 6: Final answer
   x = 108.99