Finding the Fourth Proportional to 321.42, 481.59 and 156.72

Step by Step Solution

1. Step 1: Write the proportion equation
   321.42 : 481.59 = 156.72 : x
2. Step 2: Convert to fraction form
   321.42/481.59 = 156.72/x
3. Step 3: Cross multiply
   321.42x = 481.59 × 156.72
4. Step 4: Simplify right side
   321.42x = 75,474.78
5. Step 5: Solve for x
   x = 75,474.78/321.42
6. Step 6: Final answer
   x = 234.82