Finding the Fourth Proportional to 21,068.07, 31,594.35 and 8,581.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,068.07 : 31,594.35 = 8,581.31 : x
2. Step 2: Convert to fraction form
   21,068.07/31,594.35 = 8,581.31/x
3. Step 3: Cross multiply
   21,068.07x = 31,594.35 × 8,581.31
4. Step 4: Simplify right side
   21,068.07x = 271,120,990.58
5. Step 5: Solve for x
   x = 271,120,990.58/21,068.07
6. Step 6: Final answer
   x = 12,868.81