Finding the Fourth Proportional to 12,409.15, 17,107.86 and 8,423.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,409.15 : 17,107.86 = 8,423.34 : x
2. Step 2: Convert to fraction form
   12,409.15/17,107.86 = 8,423.34/x
3. Step 3: Cross multiply
   12,409.15x = 17,107.86 × 8,423.34
4. Step 4: Simplify right side
   12,409.15x = 144,105,343.16
5. Step 5: Solve for x
   x = 144,105,343.16/12,409.15
6. Step 6: Final answer
   x = 11,612.83