Finding the Fourth Proportional to 8,139.64, 12,198.64 and 2,940.52

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.64 : 12,198.64 = 2,940.52 : x
2. Step 2: Convert to fraction form
   8,139.64/12,198.64 = 2,940.52/x
3. Step 3: Cross multiply
   8,139.64x = 12,198.64 × 2,940.52
4. Step 4: Simplify right side
   8,139.64x = 35,870,344.89
5. Step 5: Solve for x
   x = 35,870,344.89/8,139.64
6. Step 6: Final answer
   x = 4,406.87