Finding the Fourth Proportional to 2,856.45, 3,942.54 and 1,861.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.45 : 3,942.54 = 1,861.98 : x
2. Step 2: Convert to fraction form
   2,856.45/3,942.54 = 1,861.98/x
3. Step 3: Cross multiply
   2,856.45x = 3,942.54 × 1,861.98
4. Step 4: Simplify right side
   2,856.45x = 7,340,930.63
5. Step 5: Solve for x
   x = 7,340,930.63/2,856.45
6. Step 6: Final answer
   x = 2,569.95