Finding the Fourth Proportional to 12,239.03, 18,357.57 and 3,916.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,239.03 : 18,357.57 = 3,916.81 : x
2. Step 2: Convert to fraction form
   12,239.03/18,357.57 = 3,916.81/x
3. Step 3: Cross multiply
   12,239.03x = 18,357.57 × 3,916.81
4. Step 4: Simplify right side
   12,239.03x = 71,903,067.86
5. Step 5: Solve for x
   x = 71,903,067.86/12,239.03
6. Step 6: Final answer
   x = 5,874.90