Finding the Fourth Proportional to 16,479.16, 22,737.78 and 9,405.40

Step by Step Solution

1. Step 1: Write the proportion equation
   16,479.16 : 22,737.78 = 9,405.40 : x
2. Step 2: Convert to fraction form
   16,479.16/22,737.78 = 9,405.40/x
3. Step 3: Cross multiply
   16,479.16x = 22,737.78 × 9,405.40
4. Step 4: Simplify right side
   16,479.16x = 213,857,916.01
5. Step 5: Solve for x
   x = 213,857,916.01/16,479.16
6. Step 6: Final answer
   x = 12,977.48