Finding the Fourth Proportional to 21,061.34, 31,592.11 and 8,581.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.34 : 31,592.11 = 8,581.48 : x
2. Step 2: Convert to fraction form
   21,061.34/31,592.11 = 8,581.48/x
3. Step 3: Cross multiply
   21,061.34x = 31,592.11 × 8,581.48
4. Step 4: Simplify right side
   21,061.34x = 271,106,859.25
5. Step 5: Solve for x
   x = 271,106,859.25/21,061.34
6. Step 6: Final answer
   x = 12,872.25