Finding the Fourth Proportional to 8,116.57, 12,169.61 and 3,186.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,116.57 : 12,169.61 = 3,186.71 : x
2. Step 2: Convert to fraction form
   8,116.57/12,169.61 = 3,186.71/x
3. Step 3: Cross multiply
   8,116.57x = 12,169.61 × 3,186.71
4. Step 4: Simplify right side
   8,116.57x = 38,781,017.88
5. Step 5: Solve for x
   x = 38,781,017.88/8,116.57
6. Step 6: Final answer
   x = 4,778.01