Finding the Fourth Proportional to 8,411.83, 12,661.61 and 7,143.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,411.83 : 12,661.61 = 7,143.37 : x
2. Step 2: Convert to fraction form
   8,411.83/12,661.61 = 7,143.37/x
3. Step 3: Cross multiply
   8,411.83x = 12,661.61 × 7,143.37
4. Step 4: Simplify right side
   8,411.83x = 90,446,565.03
5. Step 5: Solve for x
   x = 90,446,565.03/8,411.83
6. Step 6: Final answer
   x = 10,752.31