Finding the Fourth Proportional to 15,863.72, 21,892.91 and 9,149.23

Step by Step Solution

1. Step 1: Write the proportion equation
   15,863.72 : 21,892.91 = 9,149.23 : x
2. Step 2: Convert to fraction form
   15,863.72/21,892.91 = 9,149.23/x
3. Step 3: Cross multiply
   15,863.72x = 21,892.91 × 9,149.23
4. Step 4: Simplify right side
   15,863.72x = 200,303,168.48
5. Step 5: Solve for x
   x = 200,303,168.48/15,863.72
6. Step 6: Final answer
   x = 12,626.49