Finding the Fourth Proportional to 2,557.20, 3,835.89 and 683.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.20 : 3,835.89 = 683.07 : x
2. Step 2: Convert to fraction form
   2,557.20/3,835.89 = 683.07/x
3. Step 3: Cross multiply
   2,557.20x = 3,835.89 × 683.07
4. Step 4: Simplify right side
   2,557.20x = 2,620,181.38
5. Step 5: Solve for x
   x = 2,620,181.38/2,557.20
6. Step 6: Final answer
   x = 1,024.63