Finding the Fourth Proportional to 21,152.24, 31,728.59 and 8,669.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,152.24 : 31,728.59 = 8,669.06 : x
2. Step 2: Convert to fraction form
   21,152.24/31,728.59 = 8,669.06/x
3. Step 3: Cross multiply
   21,152.24x = 31,728.59 × 8,669.06
4. Step 4: Simplify right side
   21,152.24x = 275,057,050.43
5. Step 5: Solve for x
   x = 275,057,050.43/21,152.24
6. Step 6: Final answer
   x = 13,003.68