Finding the Fourth Proportional to 2,500.57, 3,749.90 and 856.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,500.57 : 3,749.90 = 856.68 : x
2. Step 2: Convert to fraction form
   2,500.57/3,749.90 = 856.68/x
3. Step 3: Cross multiply
   2,500.57x = 3,749.90 × 856.68
4. Step 4: Simplify right side
   2,500.57x = 3,212,445.99
5. Step 5: Solve for x
   x = 3,212,445.99/2,500.57
6. Step 6: Final answer
   x = 1,284.68