Finding the Fourth Proportional to 22,210.92, 30,651.72 and 12,139.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,210.92 : 30,651.72 = 12,139.80 : x
2. Step 2: Convert to fraction form
   22,210.92/30,651.72 = 12,139.80/x
3. Step 3: Cross multiply
   22,210.92x = 30,651.72 × 12,139.80
4. Step 4: Simplify right side
   22,210.92x = 372,105,750.46
5. Step 5: Solve for x
   x = 372,105,750.46/22,210.92
6. Step 6: Final answer
   x = 16,753.28