Finding the Fourth Proportional to 12,426.47, 17,139.57 and 7,119.35

Step by Step Solution

1. Step 1: Write the proportion equation
   12,426.47 : 17,139.57 = 7,119.35 : x
2. Step 2: Convert to fraction form
   12,426.47/17,139.57 = 7,119.35/x
3. Step 3: Cross multiply
   12,426.47x = 17,139.57 × 7,119.35
4. Step 4: Simplify right side
   12,426.47x = 122,022,597.68
5. Step 5: Solve for x
   x = 122,022,597.68/12,426.47
6. Step 6: Final answer
   x = 9,819.57