Finding the Fourth Proportional to 11,815.22, 17,718.42 and 3,916.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,815.22 : 17,718.42 = 3,916.28 : x
2. Step 2: Convert to fraction form
   11,815.22/17,718.42 = 3,916.28/x
3. Step 3: Cross multiply
   11,815.22x = 17,718.42 × 3,916.28
4. Step 4: Simplify right side
   11,815.22x = 69,390,293.88
5. Step 5: Solve for x
   x = 69,390,293.88/11,815.22
6. Step 6: Final answer
   x = 5,872.96