Finding the Fourth Proportional to 108.83, 162.83 and 81.50

Step by Step Solution

1. Step 1: Write the proportion equation
   108.83 : 162.83 = 81.50 : x
2. Step 2: Convert to fraction form
   108.83/162.83 = 81.50/x
3. Step 3: Cross multiply
   108.83x = 162.83 × 81.50
4. Step 4: Simplify right side
   108.83x = 13,269.42
5. Step 5: Solve for x
   x = 13,269.42/108.83
6. Step 6: Final answer
   x = 121.93