Finding the Fourth Proportional to 2,804.86, 4,207.69 and 856.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,804.86 : 4,207.69 = 856.81 : x
2. Step 2: Convert to fraction form
   2,804.86/4,207.69 = 856.81/x
3. Step 3: Cross multiply
   2,804.86x = 4,207.69 × 856.81
4. Step 4: Simplify right side
   2,804.86x = 3,605,169.83
5. Step 5: Solve for x
   x = 3,605,169.83/2,804.86
6. Step 6: Final answer
   x = 1,285.33