Finding the Fourth Proportional to 2,638.98, 3,959.82 and 996.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.98 : 3,959.82 = 996.57 : x
2. Step 2: Convert to fraction form
   2,638.98/3,959.82 = 996.57/x
3. Step 3: Cross multiply
   2,638.98x = 3,959.82 × 996.57
4. Step 4: Simplify right side
   2,638.98x = 3,946,237.82
5. Step 5: Solve for x
   x = 3,946,237.82/2,638.98
6. Step 6: Final answer
   x = 1,495.36