Finding the Fourth Proportional to 12,399.08, 17,105.91 and 7,020.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.08 : 17,105.91 = 7,020.28 : x
2. Step 2: Convert to fraction form
   12,399.08/17,105.91 = 7,020.28/x
3. Step 3: Cross multiply
   12,399.08x = 17,105.91 × 7,020.28
4. Step 4: Simplify right side
   12,399.08x = 120,088,266.22
5. Step 5: Solve for x
   x = 120,088,266.22/12,399.08
6. Step 6: Final answer
   x = 9,685.25