Finding the Fourth Proportional to 2,641.87, 3,963.38 and 998.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.87 : 3,963.38 = 998.42 : x
2. Step 2: Convert to fraction form
   2,641.87/3,963.38 = 998.42/x
3. Step 3: Cross multiply
   2,641.87x = 3,963.38 × 998.42
4. Step 4: Simplify right side
   2,641.87x = 3,957,117.86
5. Step 5: Solve for x
   x = 3,957,117.86/2,641.87
6. Step 6: Final answer
   x = 1,497.85