Finding the Fourth Proportional to 1,018.27, 1,405.04 and 664.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.27 : 1,405.04 = 664.10 : x
2. Step 2: Convert to fraction form
   1,018.27/1,405.04 = 664.10/x
3. Step 3: Cross multiply
   1,018.27x = 1,405.04 × 664.10
4. Step 4: Simplify right side
   1,018.27x = 933,078.38
5. Step 5: Solve for x
   x = 933,078.38/1,018.27
6. Step 6: Final answer
   x = 916.34