Finding the Fourth Proportional to 2,618.81, 3,925.45 and 863.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.81 : 3,925.45 = 863.36 : x
2. Step 2: Convert to fraction form
   2,618.81/3,925.45 = 863.36/x
3. Step 3: Cross multiply
   2,618.81x = 3,925.45 × 863.36
4. Step 4: Simplify right side
   2,618.81x = 3,389,076.51
5. Step 5: Solve for x
   x = 3,389,076.51/2,618.81
6. Step 6: Final answer
   x = 1,294.13