Finding the Fourth Proportional to 2,540.52, 3,810.78 and 691.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.52 : 3,810.78 = 691.83 : x
2. Step 2: Convert to fraction form
   2,540.52/3,810.78 = 691.83/x
3. Step 3: Cross multiply
   2,540.52x = 3,810.78 × 691.83
4. Step 4: Simplify right side
   2,540.52x = 2,636,411.93
5. Step 5: Solve for x
   x = 2,636,411.93/2,540.52
6. Step 6: Final answer
   x = 1,037.75