Finding the Fourth Proportional to 1,335.39, 2,002.69 and 398.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.39 : 2,002.69 = 398.41 : x
2. Step 2: Convert to fraction form
   1,335.39/2,002.69 = 398.41/x
3. Step 3: Cross multiply
   1,335.39x = 2,002.69 × 398.41
4. Step 4: Simplify right side
   1,335.39x = 797,891.72
5. Step 5: Solve for x
   x = 797,891.72/1,335.39
6. Step 6: Final answer
   x = 597.50