Finding the Fourth Proportional to 2,638.87, 3,957.18 and 1,077.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.87 : 3,957.18 = 1,077.82 : x
2. Step 2: Convert to fraction form
   2,638.87/3,957.18 = 1,077.82/x
3. Step 3: Cross multiply
   2,638.87x = 3,957.18 × 1,077.82
4. Step 4: Simplify right side
   2,638.87x = 4,265,127.75
5. Step 5: Solve for x
   x = 4,265,127.75/2,638.87
6. Step 6: Final answer
   x = 1,616.27