Finding the Fourth Proportional to 2,146.05, 3,219.18 and 685.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.05 : 3,219.18 = 685.31 : x
2. Step 2: Convert to fraction form
   2,146.05/3,219.18 = 685.31/x
3. Step 3: Cross multiply
   2,146.05x = 3,219.18 × 685.31
4. Step 4: Simplify right side
   2,146.05x = 2,206,120.15
5. Step 5: Solve for x
   x = 2,206,120.15/2,146.05
6. Step 6: Final answer
   x = 1,027.99