Finding the Fourth Proportional to 12,078.81, 18,116.27 and 3,311.68

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.81 : 18,116.27 = 3,311.68 : x
2. Step 2: Convert to fraction form
   12,078.81/18,116.27 = 3,311.68/x
3. Step 3: Cross multiply
   12,078.81x = 18,116.27 × 3,311.68
4. Step 4: Simplify right side
   12,078.81x = 59,995,289.03
5. Step 5: Solve for x
   x = 59,995,289.03/12,078.81
6. Step 6: Final answer
   x = 4,966.99