Finding the Fourth Proportional to 12,158.12, 16,767.86 and 8,387.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,158.12 : 16,767.86 = 8,387.30 : x
2. Step 2: Convert to fraction form
   12,158.12/16,767.86 = 8,387.30/x
3. Step 3: Cross multiply
   12,158.12x = 16,767.86 × 8,387.30
4. Step 4: Simplify right side
   12,158.12x = 140,636,946.40
5. Step 5: Solve for x
   x = 140,636,946.40/12,158.12
6. Step 6: Final answer
   x = 11,567.33