Finding the Fourth Proportional to 2,863.17, 3,939.72 and 2,777.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,863.17 : 3,939.72 = 2,777.58 : x
2. Step 2: Convert to fraction form
   2,863.17/3,939.72 = 2,777.58/x
3. Step 3: Cross multiply
   2,863.17x = 3,939.72 × 2,777.58
4. Step 4: Simplify right side
   2,863.17x = 10,942,887.48
5. Step 5: Solve for x
   x = 10,942,887.48/2,863.17
6. Step 6: Final answer
   x = 3,821.95