Finding the Fourth Proportional to 144.00, 198.71 and 78.50

Step by Step Solution

1. Step 1: Write the proportion equation
   144.00 : 198.71 = 78.50 : x
2. Step 2: Convert to fraction form
   144.00/198.71 = 78.50/x
3. Step 3: Cross multiply
   144.00x = 198.71 × 78.50
4. Step 4: Simplify right side
   144.00x = 15,598.83
5. Step 5: Solve for x
   x = 15,598.83/144.00
6. Step 6: Final answer
   x = 108.33