Finding the Fourth Proportional to 1,398.64, 1,930.20 and 801.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.64 : 1,930.20 = 801.32 : x
2. Step 2: Convert to fraction form
   1,398.64/1,930.20 = 801.32/x
3. Step 3: Cross multiply
   1,398.64x = 1,930.20 × 801.32
4. Step 4: Simplify right side
   1,398.64x = 1,546,707.86
5. Step 5: Solve for x
   x = 1,546,707.86/1,398.64
6. Step 6: Final answer
   x = 1,105.87