Finding the Fourth Proportional to 12,672.72, 17,494.02 and 8,431.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,672.72 : 17,494.02 = 8,431.29 : x
2. Step 2: Convert to fraction form
   12,672.72/17,494.02 = 8,431.29/x
3. Step 3: Cross multiply
   12,672.72x = 17,494.02 × 8,431.29
4. Step 4: Simplify right side
   12,672.72x = 147,497,155.89
5. Step 5: Solve for x
   x = 147,497,155.89/12,672.72
6. Step 6: Final answer
   x = 11,638.95