Finding the Fourth Proportional to 2,145.27, 3,218.25 and 828.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.27 : 3,218.25 = 828.96 : x
2. Step 2: Convert to fraction form
   2,145.27/3,218.25 = 828.96/x
3. Step 3: Cross multiply
   2,145.27x = 3,218.25 × 828.96
4. Step 4: Simplify right side
   2,145.27x = 2,667,800.52
5. Step 5: Solve for x
   x = 2,667,800.52/2,145.27
6. Step 6: Final answer
   x = 1,243.57