Finding the Fourth Proportional to 2,638.98, 3,955.98 and 996.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.98 : 3,955.98 = 996.60 : x
2. Step 2: Convert to fraction form
   2,638.98/3,955.98 = 996.60/x
3. Step 3: Cross multiply
   2,638.98x = 3,955.98 × 996.60
4. Step 4: Simplify right side
   2,638.98x = 3,942,529.67
5. Step 5: Solve for x
   x = 3,942,529.67/2,638.98
6. Step 6: Final answer
   x = 1,493.96