Finding the Fourth Proportional to 196.45, 294.71 and 128.05

Step by Step Solution

1. Step 1: Write the proportion equation
   196.45 : 294.71 = 128.05 : x
2. Step 2: Convert to fraction form
   196.45/294.71 = 128.05/x
3. Step 3: Cross multiply
   196.45x = 294.71 × 128.05
4. Step 4: Simplify right side
   196.45x = 37,737.62
5. Step 5: Solve for x
   x = 37,737.62/196.45
6. Step 6: Final answer
   x = 192.10