Finding the Fourth Proportional to 21,643.43, 32,479.72 and 8,494.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,643.43 : 32,479.72 = 8,494.25 : x
2. Step 2: Convert to fraction form
   21,643.43/32,479.72 = 8,494.25/x
3. Step 3: Cross multiply
   21,643.43x = 32,479.72 × 8,494.25
4. Step 4: Simplify right side
   21,643.43x = 275,890,861.61
5. Step 5: Solve for x
   x = 275,890,861.61/21,643.43
6. Step 6: Final answer
   x = 12,747.10