Finding the Fourth Proportional to 2,821.63, 3,859.31 and 2,776.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,821.63 : 3,859.31 = 2,776.27 : x
2. Step 2: Convert to fraction form
   2,821.63/3,859.31 = 2,776.27/x
3. Step 3: Cross multiply
   2,821.63x = 3,859.31 × 2,776.27
4. Step 4: Simplify right side
   2,821.63x = 10,714,486.57
5. Step 5: Solve for x
   x = 10,714,486.57/2,821.63
6. Step 6: Final answer
   x = 3,797.27