Finding the Fourth Proportional to 12,479.61, 17,228.78 and 8,506.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,479.61 : 17,228.78 = 8,506.56 : x
2. Step 2: Convert to fraction form
   12,479.61/17,228.78 = 8,506.56/x
3. Step 3: Cross multiply
   12,479.61x = 17,228.78 × 8,506.56
4. Step 4: Simplify right side
   12,479.61x = 146,557,650.80
5. Step 5: Solve for x
   x = 146,557,650.80/12,479.61
6. Step 6: Final answer
   x = 11,743.77