Finding the Fourth Proportional to 2,540.42, 3,810.59 and 691.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.42 : 3,810.59 = 691.71 : x
2. Step 2: Convert to fraction form
   2,540.42/3,810.59 = 691.71/x
3. Step 3: Cross multiply
   2,540.42x = 3,810.59 × 691.71
4. Step 4: Simplify right side
   2,540.42x = 2,635,823.21
5. Step 5: Solve for x
   x = 2,635,823.21/2,540.42
6. Step 6: Final answer
   x = 1,037.55