Finding the Fourth Proportional to 12,628.16, 17,426.88 and 7,039.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,628.16 : 17,426.88 = 7,039.04 : x
2. Step 2: Convert to fraction form
   12,628.16/17,426.88 = 7,039.04/x
3. Step 3: Cross multiply
   12,628.16x = 17,426.88 × 7,039.04
4. Step 4: Simplify right side
   12,628.16x = 122,668,505.40
5. Step 5: Solve for x
   x = 122,668,505.40/12,628.16
6. Step 6: Final answer
   x = 9,713.89