Finding the Fourth Proportional to 21,064.38, 31,578.06 and 8,594.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,064.38 : 31,578.06 = 8,594.91 : x
2. Step 2: Convert to fraction form
   21,064.38/31,578.06 = 8,594.91/x
3. Step 3: Cross multiply
   21,064.38x = 31,578.06 × 8,594.91
4. Step 4: Simplify right side
   21,064.38x = 271,410,425.78
5. Step 5: Solve for x
   x = 271,410,425.78/21,064.38
6. Step 6: Final answer
   x = 12,884.80