Finding the Fourth Proportional to 196.72, 271.52 and 155.31

Step by Step Solution

1. Step 1: Write the proportion equation
   196.72 : 271.52 = 155.31 : x
2. Step 2: Convert to fraction form
   196.72/271.52 = 155.31/x
3. Step 3: Cross multiply
   196.72x = 271.52 × 155.31
4. Step 4: Simplify right side
   196.72x = 42,169.77
5. Step 5: Solve for x
   x = 42,169.77/196.72
6. Step 6: Final answer
   x = 214.36