Finding the Fourth Proportional to 12,730.78, 17,568.42 and 7,141.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,730.78 : 17,568.42 = 7,141.78 : x
2. Step 2: Convert to fraction form
   12,730.78/17,568.42 = 7,141.78/x
3. Step 3: Cross multiply
   12,730.78x = 17,568.42 × 7,141.78
4. Step 4: Simplify right side
   12,730.78x = 125,469,790.59
5. Step 5: Solve for x
   x = 125,469,790.59/12,730.78
6. Step 6: Final answer
   x = 9,855.62