Finding the Fourth Proportional to 12,137.43, 18,209.76 and 3,818.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,137.43 : 18,209.76 = 3,818.60 : x
2. Step 2: Convert to fraction form
   12,137.43/18,209.76 = 3,818.60/x
3. Step 3: Cross multiply
   12,137.43x = 18,209.76 × 3,818.60
4. Step 4: Simplify right side
   12,137.43x = 69,535,789.54
5. Step 5: Solve for x
   x = 69,535,789.54/12,137.43
6. Step 6: Final answer
   x = 5,729.04