Finding the Fourth Proportional to 1,091.94, 1,638.06 and 398.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.94 : 1,638.06 = 398.52 : x
2. Step 2: Convert to fraction form
   1,091.94/1,638.06 = 398.52/x
3. Step 3: Cross multiply
   1,091.94x = 1,638.06 × 398.52
4. Step 4: Simplify right side
   1,091.94x = 652,799.67
5. Step 5: Solve for x
   x = 652,799.67/1,091.94
6. Step 6: Final answer
   x = 597.83