Finding the Fourth Proportional to 22,290.30, 30,760.20 and 12,218.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,290.30 : 30,760.20 = 12,218.28 : x
2. Step 2: Convert to fraction form
   22,290.30/30,760.20 = 12,218.28/x
3. Step 3: Cross multiply
   22,290.30x = 30,760.20 × 12,218.28
4. Step 4: Simplify right side
   22,290.30x = 375,836,736.46
5. Step 5: Solve for x
   x = 375,836,736.46/22,290.30
6. Step 6: Final answer
   x = 16,861.00