Finding the Fourth Proportional to 2,638.10, 3,957.13 and 1,078.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.10 : 3,957.13 = 1,078.83 : x
2. Step 2: Convert to fraction form
   2,638.10/3,957.13 = 1,078.83/x
3. Step 3: Cross multiply
   2,638.10x = 3,957.13 × 1,078.83
4. Step 4: Simplify right side
   2,638.10x = 4,269,070.56
5. Step 5: Solve for x
   x = 4,269,070.56/2,638.10
6. Step 6: Final answer
   x = 1,618.24