Finding the Fourth Proportional to 8,458.83, 12,689.46 and 7,059.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,458.83 : 12,689.46 = 7,059.15 : x
2. Step 2: Convert to fraction form
   8,458.83/12,689.46 = 7,059.15/x
3. Step 3: Cross multiply
   8,458.83x = 12,689.46 × 7,059.15
4. Step 4: Simplify right side
   8,458.83x = 89,576,801.56
5. Step 5: Solve for x
   x = 89,576,801.56/8,458.83
6. Step 6: Final answer
   x = 10,589.74