Finding the Fourth Proportional to 1,099.37, 1,648.71 and 579.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.37 : 1,648.71 = 579.09 : x
2. Step 2: Convert to fraction form
   1,099.37/1,648.71 = 579.09/x
3. Step 3: Cross multiply
   1,099.37x = 1,648.71 × 579.09
4. Step 4: Simplify right side
   1,099.37x = 954,751.47
5. Step 5: Solve for x
   x = 954,751.47/1,099.37
6. Step 6: Final answer
   x = 868.45