Finding the Fourth Proportional to 12,818.26, 17,689.62 and 7,440.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.26 : 17,689.62 = 7,440.28 : x
2. Step 2: Convert to fraction form
   12,818.26/17,689.62 = 7,440.28/x
3. Step 3: Cross multiply
   12,818.26x = 17,689.62 × 7,440.28
4. Step 4: Simplify right side
   12,818.26x = 131,615,725.89
5. Step 5: Solve for x
   x = 131,615,725.89/12,818.26
6. Step 6: Final answer
   x = 10,267.83