Finding the Fourth Proportional to 1,398.65, 1,930.28 and 801.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.65 : 1,930.28 = 801.18 : x
2. Step 2: Convert to fraction form
   1,398.65/1,930.28 = 801.18/x
3. Step 3: Cross multiply
   1,398.65x = 1,930.28 × 801.18
4. Step 4: Simplify right side
   1,398.65x = 1,546,497.72
5. Step 5: Solve for x
   x = 1,546,497.72/1,398.65
6. Step 6: Final answer
   x = 1,105.71