Finding the Fourth Proportional to 12,238.28, 18,356.45 and 3,916.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.28 : 18,356.45 = 3,916.06 : x
2. Step 2: Convert to fraction form
   12,238.28/18,356.45 = 3,916.06/x
3. Step 3: Cross multiply
   12,238.28x = 18,356.45 × 3,916.06
4. Step 4: Simplify right side
   12,238.28x = 71,884,930.94
5. Step 5: Solve for x
   x = 71,884,930.94/12,238.28
6. Step 6: Final answer
   x = 5,873.78