Finding the Fourth Proportional to 12,809.42, 17,676.54 and 7,143.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,809.42 : 17,676.54 = 7,143.86 : x
2. Step 2: Convert to fraction form
   12,809.42/17,676.54 = 7,143.86/x
3. Step 3: Cross multiply
   12,809.42x = 17,676.54 × 7,143.86
4. Step 4: Simplify right side
   12,809.42x = 126,278,727.04
5. Step 5: Solve for x
   x = 126,278,727.04/12,809.42
6. Step 6: Final answer
   x = 9,858.27