Finding the Fourth Proportional to 144.01, 214.89 and 128.67

Step by Step Solution

1. Step 1: Write the proportion equation
   144.01 : 214.89 = 128.67 : x
2. Step 2: Convert to fraction form
   144.01/214.89 = 128.67/x
3. Step 3: Cross multiply
   144.01x = 214.89 × 128.67
4. Step 4: Simplify right side
   144.01x = 27,648.82
5. Step 5: Solve for x
   x = 27,648.82/144.01
6. Step 6: Final answer
   x = 192.00