Finding the Fourth Proportional to 16,998.25, 25,479.15 and 8,213.80

Step by Step Solution

1. Step 1: Write the proportion equation
   16,998.25 : 25,479.15 = 8,213.80 : x
2. Step 2: Convert to fraction form
   16,998.25/25,479.15 = 8,213.80/x
3. Step 3: Cross multiply
   16,998.25x = 25,479.15 × 8,213.80
4. Step 4: Simplify right side
   16,998.25x = 209,280,642.27
5. Step 5: Solve for x
   x = 209,280,642.27/16,998.25
6. Step 6: Final answer
   x = 12,311.89