Finding the Fourth Proportional to 2,387.25, 3,579.57 and 826.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.25 : 3,579.57 = 826.38 : x
2. Step 2: Convert to fraction form
   2,387.25/3,579.57 = 826.38/x
3. Step 3: Cross multiply
   2,387.25x = 3,579.57 × 826.38
4. Step 4: Simplify right side
   2,387.25x = 2,958,085.06
5. Step 5: Solve for x
   x = 2,958,085.06/2,387.25
6. Step 6: Final answer
   x = 1,239.12