Finding the Fourth Proportional to 2,638.78, 3,956.84 and 883.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.78 : 3,956.84 = 883.17 : x
2. Step 2: Convert to fraction form
   2,638.78/3,956.84 = 883.17/x
3. Step 3: Cross multiply
   2,638.78x = 3,956.84 × 883.17
4. Step 4: Simplify right side
   2,638.78x = 3,494,561.28
5. Step 5: Solve for x
   x = 3,494,561.28/2,638.78
6. Step 6: Final answer
   x = 1,324.31