Finding the Fourth Proportional to 22,069.72, 30,456.30 and 12,639.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,069.72 : 30,456.30 = 12,639.16 : x
2. Step 2: Convert to fraction form
   22,069.72/30,456.30 = 12,639.16/x
3. Step 3: Cross multiply
   22,069.72x = 30,456.30 × 12,639.16
4. Step 4: Simplify right side
   22,069.72x = 384,942,048.71
5. Step 5: Solve for x
   x = 384,942,048.71/22,069.72
6. Step 6: Final answer
   x = 17,442.09