Finding the Fourth Proportional to 12,409.13, 17,128.59 and 7,944.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,409.13 : 17,128.59 = 7,944.91 : x
2. Step 2: Convert to fraction form
   12,409.13/17,128.59 = 7,944.91/x
3. Step 3: Cross multiply
   12,409.13x = 17,128.59 × 7,944.91
4. Step 4: Simplify right side
   12,409.13x = 136,085,020.33
5. Step 5: Solve for x
   x = 136,085,020.33/12,409.13
6. Step 6: Final answer
   x = 10,966.52