Finding the Fourth Proportional to 12,105.78, 18,156.66 and 3,338.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,105.78 : 18,156.66 = 3,338.70 : x
2. Step 2: Convert to fraction form
   12,105.78/18,156.66 = 3,338.70/x
3. Step 3: Cross multiply
   12,105.78x = 18,156.66 × 3,338.70
4. Step 4: Simplify right side
   12,105.78x = 60,619,640.74
5. Step 5: Solve for x
   x = 60,619,640.74/12,105.78
6. Step 6: Final answer
   x = 5,007.50