Finding the Fourth Proportional to 1,105.21, 1,659.44 and 798.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.21 : 1,659.44 = 798.83 : x
2. Step 2: Convert to fraction form
   1,105.21/1,659.44 = 798.83/x
3. Step 3: Cross multiply
   1,105.21x = 1,659.44 × 798.83
4. Step 4: Simplify right side
   1,105.21x = 1,325,610.46
5. Step 5: Solve for x
   x = 1,325,610.46/1,105.21
6. Step 6: Final answer
   x = 1,199.42