Finding the Fourth Proportional to 2,640.98, 3,961.52 and 998.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.98 : 3,961.52 = 998.30 : x
2. Step 2: Convert to fraction form
   2,640.98/3,961.52 = 998.30/x
3. Step 3: Cross multiply
   2,640.98x = 3,961.52 × 998.30
4. Step 4: Simplify right side
   2,640.98x = 3,954,780.42
5. Step 5: Solve for x
   x = 3,954,780.42/2,640.98
6. Step 6: Final answer
   x = 1,497.47