Finding the Fourth Proportional to 13,689.69, 18,894.72 and 8,650.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,689.69 : 18,894.72 = 8,650.71 : x
2. Step 2: Convert to fraction form
   13,689.69/18,894.72 = 8,650.71/x
3. Step 3: Cross multiply
   13,689.69x = 18,894.72 × 8,650.71
4. Step 4: Simplify right side
   13,689.69x = 163,452,743.25
5. Step 5: Solve for x
   x = 163,452,743.25/13,689.69
6. Step 6: Final answer
   x = 11,939.84