Finding the Fourth Proportional to 12,909.66, 17,699.31 and 12,676.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,909.66 : 17,699.31 = 12,676.38 : x
2. Step 2: Convert to fraction form
   12,909.66/17,699.31 = 12,676.38/x
3. Step 3: Cross multiply
   12,909.66x = 17,699.31 × 12,676.38
4. Step 4: Simplify right side
   12,909.66x = 224,363,179.30
5. Step 5: Solve for x
   x = 224,363,179.30/12,909.66
6. Step 6: Final answer
   x = 17,379.48