Finding the Fourth Proportional to 12,789.46, 17,651.55 and 8,011.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.46 : 17,651.55 = 8,011.21 : x
2. Step 2: Convert to fraction form
   12,789.46/17,651.55 = 8,011.21/x
3. Step 3: Cross multiply
   12,789.46x = 17,651.55 × 8,011.21
4. Step 4: Simplify right side
   12,789.46x = 141,410,273.88
5. Step 5: Solve for x
   x = 141,410,273.88/12,789.46
6. Step 6: Final answer
   x = 11,056.78