Finding the Fourth Proportional to 22,158.20, 30,578.90 and 12,086.81

Step by Step Solution

1. Step 1: Write the proportion equation
   22,158.20 : 30,578.90 = 12,086.81 : x
2. Step 2: Convert to fraction form
   22,158.20/30,578.90 = 12,086.81/x
3. Step 3: Cross multiply
   22,158.20x = 30,578.90 × 12,086.81
4. Step 4: Simplify right side
   22,158.20x = 369,601,370.32
5. Step 5: Solve for x
   x = 369,601,370.32/22,158.20
6. Step 6: Final answer
   x = 16,680.12