Finding the Fourth Proportional to 12,876, 17,769.96 and 8,158.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,876 : 17,769.96 = 8,158.56 : x
2. Step 2: Convert to fraction form
   12,876/17,769.96 = 8,158.56/x
3. Step 3: Cross multiply
   12,876x = 17,769.96 × 8,158.56
4. Step 4: Simplify right side
   12,876x = 144,977,284.86
5. Step 5: Solve for x
   x = 144,977,284.86/12,876
6. Step 6: Final answer
   x = 11,259.50