Finding the Fourth Proportional to 12,786.98, 17,644.77 and 7,480.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.98 : 17,644.77 = 7,480.74 : x
2. Step 2: Convert to fraction form
   12,786.98/17,644.77 = 7,480.74/x
3. Step 3: Cross multiply
   12,786.98x = 17,644.77 × 7,480.74
4. Step 4: Simplify right side
   12,786.98x = 131,995,936.73
5. Step 5: Solve for x
   x = 131,995,936.73/12,786.98
6. Step 6: Final answer
   x = 10,322.68