Finding the Fourth Proportional to 1,099.89, 1,647.66 and 579.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.89 : 1,647.66 = 579.12 : x
2. Step 2: Convert to fraction form
   1,099.89/1,647.66 = 579.12/x
3. Step 3: Cross multiply
   1,099.89x = 1,647.66 × 579.12
4. Step 4: Simplify right side
   1,099.89x = 954,192.86
5. Step 5: Solve for x
   x = 954,192.86/1,099.89
6. Step 6: Final answer
   x = 867.53