Finding the Fourth Proportional to 12,647.29, 17,424.78 and 8,815.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,647.29 : 17,424.78 = 8,815.33 : x
2. Step 2: Convert to fraction form
   12,647.29/17,424.78 = 8,815.33/x
3. Step 3: Cross multiply
   12,647.29x = 17,424.78 × 8,815.33
4. Step 4: Simplify right side
   12,647.29x = 153,605,185.88
5. Step 5: Solve for x
   x = 153,605,185.88/12,647.29
6. Step 6: Final answer
   x = 12,145.30