Finding the Fourth Proportional to 1,361.89, 1,878.69 and 863.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.89 : 1,878.69 = 863.67 : x
2. Step 2: Convert to fraction form
   1,361.89/1,878.69 = 863.67/x
3. Step 3: Cross multiply
   1,361.89x = 1,878.69 × 863.67
4. Step 4: Simplify right side
   1,361.89x = 1,622,568.19
5. Step 5: Solve for x
   x = 1,622,568.19/1,361.89
6. Step 6: Final answer
   x = 1,191.41