Finding the Fourth Proportional to 3,813.09, 5,715.71 and 2,166.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,813.09 : 5,715.71 = 2,166.15 : x
2. Step 2: Convert to fraction form
   3,813.09/5,715.71 = 2,166.15/x
3. Step 3: Cross multiply
   3,813.09x = 5,715.71 × 2,166.15
4. Step 4: Simplify right side
   3,813.09x = 12,381,074.39
5. Step 5: Solve for x
   x = 12,381,074.39/3,813.09
6. Step 6: Final answer
   x = 3,246.99