Finding the Fourth Proportional to 196.68, 294.72 and 128.24

Step by Step Solution

1. Step 1: Write the proportion equation
   196.68 : 294.72 = 128.24 : x
2. Step 2: Convert to fraction form
   196.68/294.72 = 128.24/x
3. Step 3: Cross multiply
   196.68x = 294.72 × 128.24
4. Step 4: Simplify right side
   196.68x = 37,794.89
5. Step 5: Solve for x
   x = 37,794.89/196.68
6. Step 6: Final answer
   x = 192.16