Finding the Fourth Proportional to 22,158.12, 30,578.30 and 12,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,158.12 : 30,578.30 = 12,086.78 : x
2. Step 2: Convert to fraction form
   22,158.12/30,578.30 = 12,086.78/x
3. Step 3: Cross multiply
   22,158.12x = 30,578.30 × 12,086.78
4. Step 4: Simplify right side
   22,158.12x = 369,593,016.87
5. Step 5: Solve for x
   x = 369,593,016.87/22,158.12
6. Step 6: Final answer
   x = 16,679.80