Finding the Fourth Proportional to 12,576.28, 17,356.30 and 8,109.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,576.28 : 17,356.30 = 8,109.33 : x
2. Step 2: Convert to fraction form
   12,576.28/17,356.30 = 8,109.33/x
3. Step 3: Cross multiply
   12,576.28x = 17,356.30 × 8,109.33
4. Step 4: Simplify right side
   12,576.28x = 140,747,964.28
5. Step 5: Solve for x
   x = 140,747,964.28/12,576.28
6. Step 6: Final answer
   x = 11,191.54