Finding the Fourth Proportional to 12,786.16, 17,643 and 7,196.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.16 : 17,643 = 7,196.08 : x
2. Step 2: Convert to fraction form
   12,786.16/17,643 = 7,196.08/x
3. Step 3: Cross multiply
   12,786.16x = 17,643 × 7,196.08
4. Step 4: Simplify right side
   12,786.16x = 126,960,439.44
5. Step 5: Solve for x
   x = 126,960,439.44/12,786.16
6. Step 6: Final answer
   x = 9,929.52