Finding the Fourth Proportional to 2,856.34, 3,940.58 and 1,861.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.34 : 3,940.58 = 1,861.25 : x
2. Step 2: Convert to fraction form
   2,856.34/3,940.58 = 1,861.25/x
3. Step 3: Cross multiply
   2,856.34x = 3,940.58 × 1,861.25
4. Step 4: Simplify right side
   2,856.34x = 7,334,404.53
5. Step 5: Solve for x
   x = 7,334,404.53/2,856.34
6. Step 6: Final answer
   x = 2,567.77