Finding the Fourth Proportional to 2,145.12, 3,218.04 and 683.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.12 : 3,218.04 = 683.92 : x
2. Step 2: Convert to fraction form
   2,145.12/3,218.04 = 683.92/x
3. Step 3: Cross multiply
   2,145.12x = 3,218.04 × 683.92
4. Step 4: Simplify right side
   2,145.12x = 2,200,881.92
5. Step 5: Solve for x
   x = 2,200,881.92/2,145.12
6. Step 6: Final answer
   x = 1,025.99