Finding the Fourth Proportional to 12,636.57, 17,432.82 and 7,328.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.57 : 17,432.82 = 7,328.31 : x
2. Step 2: Convert to fraction form
   12,636.57/17,432.82 = 7,328.31/x
3. Step 3: Cross multiply
   12,636.57x = 17,432.82 × 7,328.31
4. Step 4: Simplify right side
   12,636.57x = 127,753,021.97
5. Step 5: Solve for x
   x = 127,753,021.97/12,636.57
6. Step 6: Final answer
   x = 10,109.79