Finding the Fourth Proportional to 21,069.07, 31,595.85 and 8,582.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,069.07 : 31,595.85 = 8,582.31 : x
2. Step 2: Convert to fraction form
   21,069.07/31,595.85 = 8,582.31/x
3. Step 3: Cross multiply
   21,069.07x = 31,595.85 × 8,582.31
4. Step 4: Simplify right side
   21,069.07x = 271,165,379.41
5. Step 5: Solve for x
   x = 271,165,379.41/21,069.07
6. Step 6: Final answer
   x = 12,870.31