Finding the Fourth Proportional to 11,256.72, 16,885.98 and 8,488.68

Step by Step Solution

1. Step 1: Write the proportion equation
   11,256.72 : 16,885.98 = 8,488.68 : x
2. Step 2: Convert to fraction form
   11,256.72/16,885.98 = 8,488.68/x
3. Step 3: Cross multiply
   11,256.72x = 16,885.98 × 8,488.68
4. Step 4: Simplify right side
   11,256.72x = 143,339,680.71
5. Step 5: Solve for x
   x = 143,339,680.71/11,256.72
6. Step 6: Final answer
   x = 12,733.70