Finding the Fourth Proportional to 1,089.83, 1,636.34 and 441.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.83 : 1,636.34 = 441.83 : x
2. Step 2: Convert to fraction form
   1,089.83/1,636.34 = 441.83/x
3. Step 3: Cross multiply
   1,089.83x = 1,636.34 × 441.83
4. Step 4: Simplify right side
   1,089.83x = 722,973.71
5. Step 5: Solve for x
   x = 722,973.71/1,089.83
6. Step 6: Final answer
   x = 663.39