Finding the Fourth Proportional to 1,089.82, 1,634.71 and 320.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.82 : 1,634.71 = 320.32 : x
2. Step 2: Convert to fraction form
   1,089.82/1,634.71 = 320.32/x
3. Step 3: Cross multiply
   1,089.82x = 1,634.71 × 320.32
4. Step 4: Simplify right side
   1,089.82x = 523,630.31
5. Step 5: Solve for x
   x = 523,630.31/1,089.82
6. Step 6: Final answer
   x = 480.47