Finding the Fourth Proportional to 2,386.27, 3,578.71 and 826.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.27 : 3,578.71 = 826.21 : x
2. Step 2: Convert to fraction form
   2,386.27/3,578.71 = 826.21/x
3. Step 3: Cross multiply
   2,386.27x = 3,578.71 × 826.21
4. Step 4: Simplify right side
   2,386.27x = 2,956,758.08
5. Step 5: Solve for x
   x = 2,956,758.08/2,386.27
6. Step 6: Final answer
   x = 1,239.07