Finding the Fourth Proportional to 2,140.16, 3,209.94 and 679.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.16 : 3,209.94 = 679.46 : x
2. Step 2: Convert to fraction form
   2,140.16/3,209.94 = 679.46/x
3. Step 3: Cross multiply
   2,140.16x = 3,209.94 × 679.46
4. Step 4: Simplify right side
   2,140.16x = 2,181,025.83
5. Step 5: Solve for x
   x = 2,181,025.83/2,140.16
6. Step 6: Final answer
   x = 1,019.09