Finding the Fourth Proportional to 9,144.96, 13,707.12 and 8,406.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.96 : 13,707.12 = 8,406.56 : x
2. Step 2: Convert to fraction form
   9,144.96/13,707.12 = 8,406.56/x
3. Step 3: Cross multiply
   9,144.96x = 13,707.12 × 8,406.56
4. Step 4: Simplify right side
   9,144.96x = 115,229,726.71
5. Step 5: Solve for x
   x = 115,229,726.71/9,144.96
6. Step 6: Final answer
   x = 12,600.35