Finding the Fourth Proportional to 1,096.74, 1,643.83 and 664.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.74 : 1,643.83 = 664.18 : x
2. Step 2: Convert to fraction form
   1,096.74/1,643.83 = 664.18/x
3. Step 3: Cross multiply
   1,096.74x = 1,643.83 × 664.18
4. Step 4: Simplify right side
   1,096.74x = 1,091,799.01
5. Step 5: Solve for x
   x = 1,091,799.01/1,096.74
6. Step 6: Final answer
   x = 995.49