Finding the Fourth Proportional to 1,399.27, 1,930.49 and 801.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.27 : 1,930.49 = 801.60 : x
2. Step 2: Convert to fraction form
   1,399.27/1,930.49 = 801.60/x
3. Step 3: Cross multiply
   1,399.27x = 1,930.49 × 801.60
4. Step 4: Simplify right side
   1,399.27x = 1,547,481.60
5. Step 5: Solve for x
   x = 1,547,481.60/1,399.27
6. Step 6: Final answer
   x = 1,105.92