Finding the Fourth Proportional to 8,550.18, 12,821.49 and 3,870

Step by Step Solution

1. Step 1: Write the proportion equation
   8,550.18 : 12,821.49 = 3,870 : x
2. Step 2: Convert to fraction form
   8,550.18/12,821.49 = 3,870/x
3. Step 3: Cross multiply
   8,550.18x = 12,821.49 × 3,870
4. Step 4: Simplify right side
   8,550.18x = 49,619,166.30
5. Step 5: Solve for x
   x = 49,619,166.30/8,550.18
6. Step 6: Final answer
   x = 5,803.29