Finding the Fourth Proportional to 2,631.68, 3,947.46 and 683.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.68 : 3,947.46 = 683.90 : x
2. Step 2: Convert to fraction form
   2,631.68/3,947.46 = 683.90/x
3. Step 3: Cross multiply
   2,631.68x = 3,947.46 × 683.90
4. Step 4: Simplify right side
   2,631.68x = 2,699,667.89
5. Step 5: Solve for x
   x = 2,699,667.89/2,631.68
6. Step 6: Final answer
   x = 1,025.83