Finding the Fourth Proportional to 12,676.18, 17,499.24 and 8,434.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,676.18 : 17,499.24 = 8,434.30 : x
2. Step 2: Convert to fraction form
   12,676.18/17,499.24 = 8,434.30/x
3. Step 3: Cross multiply
   12,676.18x = 17,499.24 × 8,434.30
4. Step 4: Simplify right side
   12,676.18x = 147,593,839.93
5. Step 5: Solve for x
   x = 147,593,839.93/12,676.18
6. Step 6: Final answer
   x = 11,643.40