Finding the Fourth Proportional to 3,291.31, 4,936.84 and 826.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,291.31 : 4,936.84 = 826.15 : x
2. Step 2: Convert to fraction form
   3,291.31/4,936.84 = 826.15/x
3. Step 3: Cross multiply
   3,291.31x = 4,936.84 × 826.15
4. Step 4: Simplify right side
   3,291.31x = 4,078,570.37
5. Step 5: Solve for x
   x = 4,078,570.37/3,291.31
6. Step 6: Final answer
   x = 1,239.19