Finding the Fourth Proportional to 1,361.05, 1,878.76 and 801.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.05 : 1,878.76 = 801.55 : x
2. Step 2: Convert to fraction form
   1,361.05/1,878.76 = 801.55/x
3. Step 3: Cross multiply
   1,361.05x = 1,878.76 × 801.55
4. Step 4: Simplify right side
   1,361.05x = 1,505,912.86
5. Step 5: Solve for x
   x = 1,505,912.86/1,361.05
6. Step 6: Final answer
   x = 1,106.43