Finding the Fourth Proportional to 12,404.12, 17,121.69 and 7,939.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,404.12 : 17,121.69 = 7,939.91 : x
2. Step 2: Convert to fraction form
   12,404.12/17,121.69 = 7,939.91/x
3. Step 3: Cross multiply
   12,404.12x = 17,121.69 × 7,939.91
4. Step 4: Simplify right side
   12,404.12x = 135,944,592.04
5. Step 5: Solve for x
   x = 135,944,592.04/12,404.12
6. Step 6: Final answer
   x = 10,959.64