Finding the Fourth Proportional to 21,061.49, 31,570.37 and 8,576.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.49 : 31,570.37 = 8,576.15 : x
2. Step 2: Convert to fraction form
   21,061.49/31,570.37 = 8,576.15/x
3. Step 3: Cross multiply
   21,061.49x = 31,570.37 × 8,576.15
4. Step 4: Simplify right side
   21,061.49x = 270,752,264.72
5. Step 5: Solve for x
   x = 270,752,264.72/21,061.49
6. Step 6: Final answer
   x = 12,855.32