Finding the Fourth Proportional to 11,942.29, 17,916.50 and 8,439.25

Step by Step Solution

1. Step 1: Write the proportion equation
   11,942.29 : 17,916.50 = 8,439.25 : x
2. Step 2: Convert to fraction form
   11,942.29/17,916.50 = 8,439.25/x
3. Step 3: Cross multiply
   11,942.29x = 17,916.50 × 8,439.25
4. Step 4: Simplify right side
   11,942.29x = 151,201,780.43
5. Step 5: Solve for x
   x = 151,201,780.43/11,942.29
6. Step 6: Final answer
   x = 12,661.04