Finding the Fourth Proportional to 12,928.61, 17,841.47 and 7,339.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928.61 : 17,841.47 = 7,339.61 : x
2. Step 2: Convert to fraction form
   12,928.61/17,841.47 = 7,339.61/x
3. Step 3: Cross multiply
   12,928.61x = 17,841.47 × 7,339.61
4. Step 4: Simplify right side
   12,928.61x = 130,949,305.72
5. Step 5: Solve for x
   x = 130,949,305.72/12,928.61
6. Step 6: Final answer
   x = 10,128.65