Finding the Fourth Proportional to 8,129.16, 12,185.37 and 3,196.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,129.16 : 12,185.37 = 3,196.80 : x
2. Step 2: Convert to fraction form
   8,129.16/12,185.37 = 3,196.80/x
3. Step 3: Cross multiply
   8,129.16x = 12,185.37 × 3,196.80
4. Step 4: Simplify right side
   8,129.16x = 38,954,190.82
5. Step 5: Solve for x
   x = 38,954,190.82/8,129.16
6. Step 6: Final answer
   x = 4,791.91