Finding the Fourth Proportional to 144.72, 199.72 and 86.50

Step by Step Solution

1. Step 1: Write the proportion equation
   144.72 : 199.72 = 86.50 : x
2. Step 2: Convert to fraction form
   144.72/199.72 = 86.50/x
3. Step 3: Cross multiply
   144.72x = 199.72 × 86.50
4. Step 4: Simplify right side
   144.72x = 17,275.78
5. Step 5: Solve for x
   x = 17,275.78/144.72
6. Step 6: Final answer
   x = 119.37