Finding the Fourth Proportional to 16,997.88, 25,478.59 and 8,213.43

Step by Step Solution

1. Step 1: Write the proportion equation
   16,997.88 : 25,478.59 = 8,213.43 : x
2. Step 2: Convert to fraction form
   16,997.88/25,478.59 = 8,213.43/x
3. Step 3: Cross multiply
   16,997.88x = 25,478.59 × 8,213.43
4. Step 4: Simplify right side
   16,997.88x = 209,266,447.00
5. Step 5: Solve for x
   x = 209,266,447.00/16,997.88
6. Step 6: Final answer
   x = 12,311.33