Finding the Fourth Proportional to 1,108.69, 1,661.72 and 798.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.69 : 1,661.72 = 798.86 : x
2. Step 2: Convert to fraction form
   1,108.69/1,661.72 = 798.86/x
3. Step 3: Cross multiply
   1,108.69x = 1,661.72 × 798.86
4. Step 4: Simplify right side
   1,108.69x = 1,327,481.80
5. Step 5: Solve for x
   x = 1,327,481.80/1,108.69
6. Step 6: Final answer
   x = 1,197.35