Finding the Fourth Proportional to 12,238.17, 18,358.46 and 3,916.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.17 : 18,358.46 = 3,916.09 : x
2. Step 2: Convert to fraction form
   12,238.17/18,358.46 = 3,916.09/x
3. Step 3: Cross multiply
   12,238.17x = 18,358.46 × 3,916.09
4. Step 4: Simplify right side
   12,238.17x = 71,893,381.62
5. Step 5: Solve for x
   x = 71,893,381.62/12,238.17
6. Step 6: Final answer
   x = 5,874.52