Finding the Fourth Proportional to 22,359.40, 30,856.50 and 12,288.79

Step by Step Solution

1. Step 1: Write the proportion equation
   22,359.40 : 30,856.50 = 12,288.79 : x
2. Step 2: Convert to fraction form
   22,359.40/30,856.50 = 12,288.79/x
3. Step 3: Cross multiply
   22,359.40x = 30,856.50 × 12,288.79
4. Step 4: Simplify right side
   22,359.40x = 379,189,048.64
5. Step 5: Solve for x
   x = 379,189,048.64/22,359.40
6. Step 6: Final answer
   x = 16,958.82