Finding the Fourth Proportional to 12,409.01, 17,128.42 and 7,944.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,409.01 : 17,128.42 = 7,944.78 : x
2. Step 2: Convert to fraction form
   12,409.01/17,128.42 = 7,944.78/x
3. Step 3: Cross multiply
   12,409.01x = 17,128.42 × 7,944.78
4. Step 4: Simplify right side
   12,409.01x = 136,081,508.79
5. Step 5: Solve for x
   x = 136,081,508.79/12,409.01
6. Step 6: Final answer
   x = 10,966.35