Finding the Fourth Proportional to 8,118.10, 12,168.15 and 3,186.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,118.10 : 12,168.15 = 3,186.10 : x
2. Step 2: Convert to fraction form
   8,118.10/12,168.15 = 3,186.10/x
3. Step 3: Cross multiply
   8,118.10x = 12,168.15 × 3,186.10
4. Step 4: Simplify right side
   8,118.10x = 38,768,942.72
5. Step 5: Solve for x
   x = 38,768,942.72/8,118.10
6. Step 6: Final answer
   x = 4,775.62