Finding the Fourth Proportional to 12,643.52, 17,443.89 and 8,169.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,643.52 : 17,443.89 = 8,169.91 : x
2. Step 2: Convert to fraction form
   12,643.52/17,443.89 = 8,169.91/x
3. Step 3: Cross multiply
   12,643.52x = 17,443.89 × 8,169.91
4. Step 4: Simplify right side
   12,643.52x = 142,515,011.35
5. Step 5: Solve for x
   x = 142,515,011.35/12,643.52
6. Step 6: Final answer
   x = 11,271.78