Finding the Fourth Proportional to 196.76, 270.61 and 156.96

Step by Step Solution

1. Step 1: Write the proportion equation
   196.76 : 270.61 = 156.96 : x
2. Step 2: Convert to fraction form
   196.76/270.61 = 156.96/x
3. Step 3: Cross multiply
   196.76x = 270.61 × 156.96
4. Step 4: Simplify right side
   196.76x = 42,474.55
5. Step 5: Solve for x
   x = 42,474.55/196.76
6. Step 6: Final answer
   x = 215.87