Finding the Fourth Proportional to 2,568.68, 3,861.56 and 2,109.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.68 : 3,861.56 = 2,109.86 : x
2. Step 2: Convert to fraction form
   2,568.68/3,861.56 = 2,109.86/x
3. Step 3: Cross multiply
   2,568.68x = 3,861.56 × 2,109.86
4. Step 4: Simplify right side
   2,568.68x = 8,147,350.98
5. Step 5: Solve for x
   x = 8,147,350.98/2,568.68
6. Step 6: Final answer
   x = 3,171.80