Finding the Fourth Proportional to 2,540.28, 3,810.15 and 691.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.28 : 3,810.15 = 691.59 : x
2. Step 2: Convert to fraction form
   2,540.28/3,810.15 = 691.59/x
3. Step 3: Cross multiply
   2,540.28x = 3,810.15 × 691.59
4. Step 4: Simplify right side
   2,540.28x = 2,635,061.64
5. Step 5: Solve for x
   x = 2,635,061.64/2,540.28
6. Step 6: Final answer
   x = 1,037.31