Finding the Fourth Proportional to 12,424.11, 17,145.59 and 7,120.65

Step by Step Solution

1. Step 1: Write the proportion equation
   12,424.11 : 17,145.59 = 7,120.65 : x
2. Step 2: Convert to fraction form
   12,424.11/17,145.59 = 7,120.65/x
3. Step 3: Cross multiply
   12,424.11x = 17,145.59 × 7,120.65
4. Step 4: Simplify right side
   12,424.11x = 122,087,709.83
5. Step 5: Solve for x
   x = 122,087,709.83/12,424.11
6. Step 6: Final answer
   x = 9,826.68