Finding the Fourth Proportional to 12,786.50, 17,646.99 and 7,198.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.50 : 17,646.99 = 7,198.58 : x
2. Step 2: Convert to fraction form
   12,786.50/17,646.99 = 7,198.58/x
3. Step 3: Cross multiply
   12,786.50x = 17,646.99 × 7,198.58
4. Step 4: Simplify right side
   12,786.50x = 127,033,269.27
5. Step 5: Solve for x
   x = 127,033,269.27/12,786.50
6. Step 6: Final answer
   x = 9,934.95