Finding the Fourth Proportional to 162.20, 243.41 and 131.83

Step by Step Solution

1. Step 1: Write the proportion equation
   162.20 : 243.41 = 131.83 : x
2. Step 2: Convert to fraction form
   162.20/243.41 = 131.83/x
3. Step 3: Cross multiply
   162.20x = 243.41 × 131.83
4. Step 4: Simplify right side
   162.20x = 32,087.47
5. Step 5: Solve for x
   x = 32,087.47/162.20
6. Step 6: Final answer
   x = 197.82