Finding the Fourth Proportional to 22,389.72, 30,901.68 and 12,963.48

Step by Step Solution

1. Step 1: Write the proportion equation
   22,389.72 : 30,901.68 = 12,963.48 : x
2. Step 2: Convert to fraction form
   22,389.72/30,901.68 = 12,963.48/x
3. Step 3: Cross multiply
   22,389.72x = 30,901.68 × 12,963.48
4. Step 4: Simplify right side
   22,389.72x = 400,593,310.65
5. Step 5: Solve for x
   x = 400,593,310.65/22,389.72
6. Step 6: Final answer
   x = 17,891.84