Finding the Fourth Proportional to 1,128.82, 1,693.43 and 398.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.82 : 1,693.43 = 398.82 : x
2. Step 2: Convert to fraction form
   1,128.82/1,693.43 = 398.82/x
3. Step 3: Cross multiply
   1,128.82x = 1,693.43 × 398.82
4. Step 4: Simplify right side
   1,128.82x = 675,373.75
5. Step 5: Solve for x
   x = 675,373.75/1,128.82
6. Step 6: Final answer
   x = 598.30