Finding the Fourth Proportional to 2,631.39, 3,946.78 and 683.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.39 : 3,946.78 = 683.74 : x
2. Step 2: Convert to fraction form
   2,631.39/3,946.78 = 683.74/x
3. Step 3: Cross multiply
   2,631.39x = 3,946.78 × 683.74
4. Step 4: Simplify right side
   2,631.39x = 2,698,573.30
5. Step 5: Solve for x
   x = 2,698,573.30/2,631.39
6. Step 6: Final answer
   x = 1,025.53