Finding the Fourth Proportional to 2,638.31, 3,957.42 and 1,077.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.31 : 3,957.42 = 1,077.98 : x
2. Step 2: Convert to fraction form
   2,638.31/3,957.42 = 1,077.98/x
3. Step 3: Cross multiply
   2,638.31x = 3,957.42 × 1,077.98
4. Step 4: Simplify right side
   2,638.31x = 4,265,999.82
5. Step 5: Solve for x
   x = 4,265,999.82/2,638.31
6. Step 6: Final answer
   x = 1,616.95