Finding the Fourth Proportional to 2,557.97, 3,836.52 and 826.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.97 : 3,836.52 = 826.60 : x
2. Step 2: Convert to fraction form
   2,557.97/3,836.52 = 826.60/x
3. Step 3: Cross multiply
   2,557.97x = 3,836.52 × 826.60
4. Step 4: Simplify right side
   2,557.97x = 3,171,267.43
5. Step 5: Solve for x
   x = 3,171,267.43/2,557.97
6. Step 6: Final answer
   x = 1,239.76