Finding the Fourth Proportional to 16,716.42, 25,062.78 and 8,390.42

Step by Step Solution

1. Step 1: Write the proportion equation
   16,716.42 : 25,062.78 = 8,390.42 : x
2. Step 2: Convert to fraction form
   16,716.42/25,062.78 = 8,390.42/x
3. Step 3: Cross multiply
   16,716.42x = 25,062.78 × 8,390.42
4. Step 4: Simplify right side
   16,716.42x = 210,287,250.57
5. Step 5: Solve for x
   x = 210,287,250.57/16,716.42
6. Step 6: Final answer
   x = 12,579.68