Finding the Fourth Proportional to 8,562.31, 12,843.52 and 2,639.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,562.31 : 12,843.52 = 2,639.12 : x
2. Step 2: Convert to fraction form
   8,562.31/12,843.52 = 2,639.12/x
3. Step 3: Cross multiply
   8,562.31x = 12,843.52 × 2,639.12
4. Step 4: Simplify right side
   8,562.31x = 33,895,590.50
5. Step 5: Solve for x
   x = 33,895,590.50/8,562.31
6. Step 6: Final answer
   x = 3,958.70