Finding the Fourth Proportional to 1,390.82, 1,919.49 and 801.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.82 : 1,919.49 = 801.33 : x
2. Step 2: Convert to fraction form
   1,390.82/1,919.49 = 801.33/x
3. Step 3: Cross multiply
   1,390.82x = 1,919.49 × 801.33
4. Step 4: Simplify right side
   1,390.82x = 1,538,144.92
5. Step 5: Solve for x
   x = 1,538,144.92/1,390.82
6. Step 6: Final answer
   x = 1,105.93