Finding the Fourth Proportional to 8,582.12, 12,861.54 and 3,645.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,582.12 : 12,861.54 = 3,645.57 : x
2. Step 2: Convert to fraction form
   8,582.12/12,861.54 = 3,645.57/x
3. Step 3: Cross multiply
   8,582.12x = 12,861.54 × 3,645.57
4. Step 4: Simplify right side
   8,582.12x = 46,887,644.38
5. Step 5: Solve for x
   x = 46,887,644.38/8,582.12
6. Step 6: Final answer
   x = 5,463.41