Finding the Fourth Proportional to 2,070.32, 3,105.68 and 683.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.32 : 3,105.68 = 683.80 : x
2. Step 2: Convert to fraction form
   2,070.32/3,105.68 = 683.80/x
3. Step 3: Cross multiply
   2,070.32x = 3,105.68 × 683.80
4. Step 4: Simplify right side
   2,070.32x = 2,123,663.98
5. Step 5: Solve for x
   x = 2,123,663.98/2,070.32
6. Step 6: Final answer
   x = 1,025.77