Finding the Fourth Proportional to 1,090.72, 1,636.17 and 441.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.72 : 1,636.17 = 441.46 : x
2. Step 2: Convert to fraction form
   1,090.72/1,636.17 = 441.46/x
3. Step 3: Cross multiply
   1,090.72x = 1,636.17 × 441.46
4. Step 4: Simplify right side
   1,090.72x = 722,303.61
5. Step 5: Solve for x
   x = 722,303.61/1,090.72
6. Step 6: Final answer
   x = 662.23