Finding the Fourth Proportional to 12,986.30, 17,909.33 and 8,508.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.30 : 17,909.33 = 8,508.42 : x
2. Step 2: Convert to fraction form
   12,986.30/17,909.33 = 8,508.42/x
3. Step 3: Cross multiply
   12,986.30x = 17,909.33 × 8,508.42
4. Step 4: Simplify right side
   12,986.30x = 152,380,059.02
5. Step 5: Solve for x
   x = 152,380,059.02/12,986.30
6. Step 6: Final answer
   x = 11,733.91