Finding the Fourth Proportional to 1,361.28, 1,878.30 and 801.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.28 : 1,878.30 = 801.57 : x
2. Step 2: Convert to fraction form
   1,361.28/1,878.30 = 801.57/x
3. Step 3: Cross multiply
   1,361.28x = 1,878.30 × 801.57
4. Step 4: Simplify right side
   1,361.28x = 1,505,588.93
5. Step 5: Solve for x
   x = 1,505,588.93/1,361.28
6. Step 6: Final answer
   x = 1,106.01