Finding the Fourth Proportional to 12,560.72, 17,336.20 and 8,311.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,560.72 : 17,336.20 = 8,311.87 : x
2. Step 2: Convert to fraction form
   12,560.72/17,336.20 = 8,311.87/x
3. Step 3: Cross multiply
   12,560.72x = 17,336.20 × 8,311.87
4. Step 4: Simplify right side
   12,560.72x = 144,096,154.01
5. Step 5: Solve for x
   x = 144,096,154.01/12,560.72
6. Step 6: Final answer
   x = 11,471.97