Finding the Fourth Proportional to 196.78, 271.62 and 155.26

Step by Step Solution

1. Step 1: Write the proportion equation
   196.78 : 271.62 = 155.26 : x
2. Step 2: Convert to fraction form
   196.78/271.62 = 155.26/x
3. Step 3: Cross multiply
   196.78x = 271.62 × 155.26
4. Step 4: Simplify right side
   196.78x = 42,171.72
5. Step 5: Solve for x
   x = 42,171.72/196.78
6. Step 6: Final answer
   x = 214.31