Finding the Fourth Proportional to 8,111.20, 12,159.60 and 2,843.68

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.20 : 12,159.60 = 2,843.68 : x
2. Step 2: Convert to fraction form
   8,111.20/12,159.60 = 2,843.68/x
3. Step 3: Cross multiply
   8,111.20x = 12,159.60 × 2,843.68
4. Step 4: Simplify right side
   8,111.20x = 34,578,011.33
5. Step 5: Solve for x
   x = 34,578,011.33/8,111.20
6. Step 6: Final answer
   x = 4,263.00