Finding the Fourth Proportional to 8,613.30, 12,891.60 and 7,040.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,613.30 : 12,891.60 = 7,040.82 : x
2. Step 2: Convert to fraction form
   8,613.30/12,891.60 = 7,040.82/x
3. Step 3: Cross multiply
   8,613.30x = 12,891.60 × 7,040.82
4. Step 4: Simplify right side
   8,613.30x = 90,767,435.11
5. Step 5: Solve for x
   x = 90,767,435.11/8,613.30
6. Step 6: Final answer
   x = 10,538.06