Finding the Fourth Proportional to 12,644.34, 17,445.69 and 8,168.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,644.34 : 17,445.69 = 8,168.28 : x
2. Step 2: Convert to fraction form
   12,644.34/17,445.69 = 8,168.28/x
3. Step 3: Cross multiply
   12,644.34x = 17,445.69 × 8,168.28
4. Step 4: Simplify right side
   12,644.34x = 142,501,280.71
5. Step 5: Solve for x
   x = 142,501,280.71/12,644.34
6. Step 6: Final answer
   x = 11,269.97