Finding the Fourth Proportional to 12,786.66, 17,641.53 and 7,196.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.66 : 17,641.53 = 7,196.58 : x
2. Step 2: Convert to fraction form
   12,786.66/17,641.53 = 7,196.58/x
3. Step 3: Cross multiply
   12,786.66x = 17,641.53 × 7,196.58
4. Step 4: Simplify right side
   12,786.66x = 126,958,681.97
5. Step 5: Solve for x
   x = 126,958,681.97/12,786.66
6. Step 6: Final answer
   x = 9,928.99