Finding the Fourth Proportional to 16,128.96, 24,182.38 and 8,216.15

Step by Step Solution

1. Step 1: Write the proportion equation
   16,128.96 : 24,182.38 = 8,216.15 : x
2. Step 2: Convert to fraction form
   16,128.96/24,182.38 = 8,216.15/x
3. Step 3: Cross multiply
   16,128.96x = 24,182.38 × 8,216.15
4. Step 4: Simplify right side
   16,128.96x = 198,686,086.82
5. Step 5: Solve for x
   x = 198,686,086.82/16,128.96
6. Step 6: Final answer
   x = 12,318.60