Finding the Fourth Proportional to 2,145.69, 3,217.32 and 684.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.69 : 3,217.32 = 684.05 : x
2. Step 2: Convert to fraction form
   2,145.69/3,217.32 = 684.05/x
3. Step 3: Cross multiply
   2,145.69x = 3,217.32 × 684.05
4. Step 4: Simplify right side
   2,145.69x = 2,200,791.66
5. Step 5: Solve for x
   x = 2,200,791.66/2,145.69
6. Step 6: Final answer
   x = 1,025.68