Finding the Fourth Proportional to 2,070.43, 3,105.75 and 683.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.43 : 3,105.75 = 683.89 : x
2. Step 2: Convert to fraction form
   2,070.43/3,105.75 = 683.89/x
3. Step 3: Cross multiply
   2,070.43x = 3,105.75 × 683.89
4. Step 4: Simplify right side
   2,070.43x = 2,123,991.37
5. Step 5: Solve for x
   x = 2,123,991.37/2,070.43
6. Step 6: Final answer
   x = 1,025.87