Finding the Fourth Proportional to 2,536.76, 3,805.39 and 687.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,536.76 : 3,805.39 = 687.89 : x
2. Step 2: Convert to fraction form
   2,536.76/3,805.39 = 687.89/x
3. Step 3: Cross multiply
   2,536.76x = 3,805.39 × 687.89
4. Step 4: Simplify right side
   2,536.76x = 2,617,683.25
5. Step 5: Solve for x
   x = 2,617,683.25/2,536.76
6. Step 6: Final answer
   x = 1,031.90