Finding the Fourth Proportional to 1,391.14, 1,919.37 and 801.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.14 : 1,919.37 = 801.46 : x
2. Step 2: Convert to fraction form
   1,391.14/1,919.37 = 801.46/x
3. Step 3: Cross multiply
   1,391.14x = 1,919.37 × 801.46
4. Step 4: Simplify right side
   1,391.14x = 1,538,298.28
5. Step 5: Solve for x
   x = 1,538,298.28/1,391.14
6. Step 6: Final answer
   x = 1,105.78