Finding the Fourth Proportional to 2,146.57, 3,220.00 and 685.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.57 : 3,220.00 = 685.83 : x
2. Step 2: Convert to fraction form
   2,146.57/3,220.00 = 685.83/x
3. Step 3: Cross multiply
   2,146.57x = 3,220.00 × 685.83
4. Step 4: Simplify right side
   2,146.57x = 2,208,370.89
5. Step 5: Solve for x
   x = 2,208,370.89/2,146.57
6. Step 6: Final answer
   x = 1,028.79