Finding the Fourth Proportional to 12,409.94, 17,129.71 and 7,945.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,409.94 : 17,129.71 = 7,945.72 : x
2. Step 2: Convert to fraction form
   12,409.94/17,129.71 = 7,945.72/x
3. Step 3: Cross multiply
   12,409.94x = 17,129.71 × 7,945.72
4. Step 4: Simplify right side
   12,409.94x = 136,107,846.45
5. Step 5: Solve for x
   x = 136,107,846.45/12,409.94
6. Step 6: Final answer
   x = 10,967.65