Finding the Fourth Proportional to 1,391.39, 1,919.32 and 801.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.39 : 1,919.32 = 801.82 : x
2. Step 2: Convert to fraction form
   1,391.39/1,919.32 = 801.82/x
3. Step 3: Cross multiply
   1,391.39x = 1,919.32 × 801.82
4. Step 4: Simplify right side
   1,391.39x = 1,538,949.16
5. Step 5: Solve for x
   x = 1,538,949.16/1,391.39
6. Step 6: Final answer
   x = 1,106.05