Finding the Fourth Proportional to 12,399.03, 17,105.71 and 7,921.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.03 : 17,105.71 = 7,921.62 : x
2. Step 2: Convert to fraction form
   12,399.03/17,105.71 = 7,921.62/x
3. Step 3: Cross multiply
   12,399.03x = 17,105.71 × 7,921.62
4. Step 4: Simplify right side
   12,399.03x = 135,504,934.45
5. Step 5: Solve for x
   x = 135,504,934.45/12,399.03
6. Step 6: Final answer
   x = 10,928.67