Finding the Fourth Proportional to 2,507.78, 3,761.58 and 863.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.78 : 3,761.58 = 863.36 : x
2. Step 2: Convert to fraction form
   2,507.78/3,761.58 = 863.36/x
3. Step 3: Cross multiply
   2,507.78x = 3,761.58 × 863.36
4. Step 4: Simplify right side
   2,507.78x = 3,247,597.71
5. Step 5: Solve for x
   x = 3,247,597.71/2,507.78
6. Step 6: Final answer
   x = 1,295.01