Finding the Fourth Proportional to 2,856.96, 3,939.12 and 1,861.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.96 : 3,939.12 = 1,861.83 : x
2. Step 2: Convert to fraction form
   2,856.96/3,939.12 = 1,861.83/x
3. Step 3: Cross multiply
   2,856.96x = 3,939.12 × 1,861.83
4. Step 4: Simplify right side
   2,856.96x = 7,333,971.79
5. Step 5: Solve for x
   x = 7,333,971.79/2,856.96
6. Step 6: Final answer
   x = 2,567.05