Finding the Fourth Proportional to 12,109.16, 18,168.16 and 3,789.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.16 : 18,168.16 = 3,789.78 : x
2. Step 2: Convert to fraction form
   12,109.16/18,168.16 = 3,789.78/x
3. Step 3: Cross multiply
   12,109.16x = 18,168.16 × 3,789.78
4. Step 4: Simplify right side
   12,109.16x = 68,853,329.40
5. Step 5: Solve for x
   x = 68,853,329.40/12,109.16
6. Step 6: Final answer
   x = 5,686.05