Finding the Fourth Proportional to 1,090.62, 1,636.56 and 441.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.62 : 1,636.56 = 441.18 : x
2. Step 2: Convert to fraction form
   1,090.62/1,636.56 = 441.18/x
3. Step 3: Cross multiply
   1,090.62x = 1,636.56 × 441.18
4. Step 4: Simplify right side
   1,090.62x = 722,017.54
5. Step 5: Solve for x
   x = 722,017.54/1,090.62
6. Step 6: Final answer
   x = 662.02