Finding the Fourth Proportional to 2,070.47, 3,105.86 and 683.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.47 : 3,105.86 = 683.75 : x
2. Step 2: Convert to fraction form
   2,070.47/3,105.86 = 683.75/x
3. Step 3: Cross multiply
   2,070.47x = 3,105.86 × 683.75
4. Step 4: Simplify right side
   2,070.47x = 2,123,628.36
5. Step 5: Solve for x
   x = 2,123,628.36/2,070.47
6. Step 6: Final answer
   x = 1,025.67