Finding the Fourth Proportional to 9,107.80, 12,568.82 and 5,128.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,107.80 : 12,568.82 = 5,128.99 : x
2. Step 2: Convert to fraction form
   9,107.80/12,568.82 = 5,128.99/x
3. Step 3: Cross multiply
   9,107.80x = 12,568.82 × 5,128.99
4. Step 4: Simplify right side
   9,107.80x = 64,465,295.02
5. Step 5: Solve for x
   x = 64,465,295.02/9,107.80
6. Step 6: Final answer
   x = 7,078.03