Finding the Fourth Proportional to 12,916.15, 17,819.70 and 8,442.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,916.15 : 17,819.70 = 8,442.48 : x
2. Step 2: Convert to fraction form
   12,916.15/17,819.70 = 8,442.48/x
3. Step 3: Cross multiply
   12,916.15x = 17,819.70 × 8,442.48
4. Step 4: Simplify right side
   12,916.15x = 150,442,460.86
5. Step 5: Solve for x
   x = 150,442,460.86/12,916.15
6. Step 6: Final answer
   x = 11,647.62