Finding the Fourth Proportional to 196.94, 271.89 and 137.21

Step by Step Solution

1. Step 1: Write the proportion equation
   196.94 : 271.89 = 137.21 : x
2. Step 2: Convert to fraction form
   196.94/271.89 = 137.21/x
3. Step 3: Cross multiply
   196.94x = 271.89 × 137.21
4. Step 4: Simplify right side
   196.94x = 37,304.15
5. Step 5: Solve for x
   x = 37,304.15/196.94
6. Step 6: Final answer
   x = 189.42