Finding the Fourth Proportional to 21,074.56, 31,593.21 and 8,605

Step by Step Solution

1. Step 1: Write the proportion equation
   21,074.56 : 31,593.21 = 8,605 : x
2. Step 2: Convert to fraction form
   21,074.56/31,593.21 = 8,605/x
3. Step 3: Cross multiply
   21,074.56x = 31,593.21 × 8,605
4. Step 4: Simplify right side
   21,074.56x = 271,859,572.05
5. Step 5: Solve for x
   x = 271,859,572.05/21,074.56
6. Step 6: Final answer
   x = 12,899.89