Finding the Fourth Proportional to 12,895.62, 17,789.61 and 8,121.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,895.62 : 17,789.61 = 8,121.30 : x
2. Step 2: Convert to fraction form
   12,895.62/17,789.61 = 8,121.30/x
3. Step 3: Cross multiply
   12,895.62x = 17,789.61 × 8,121.30
4. Step 4: Simplify right side
   12,895.62x = 144,474,759.69
5. Step 5: Solve for x
   x = 144,474,759.69/12,895.62
6. Step 6: Final answer
   x = 11,203.40