Finding the Fourth Proportional to 196.89, 294.72 and 128.27

Step by Step Solution

1. Step 1: Write the proportion equation
   196.89 : 294.72 = 128.27 : x
2. Step 2: Convert to fraction form
   196.89/294.72 = 128.27/x
3. Step 3: Cross multiply
   196.89x = 294.72 × 128.27
4. Step 4: Simplify right side
   196.89x = 37,802.26
5. Step 5: Solve for x
   x = 37,802.26/196.89
6. Step 6: Final answer
   x = 192.00