Finding the Fourth Proportional to 1,109.69, 1,663.21 and 799.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.69 : 1,663.21 = 799.86 : x
2. Step 2: Convert to fraction form
   1,109.69/1,663.21 = 799.86/x
3. Step 3: Cross multiply
   1,109.69x = 1,663.21 × 799.86
4. Step 4: Simplify right side
   1,109.69x = 1,330,335.15
5. Step 5: Solve for x
   x = 1,330,335.15/1,109.69
6. Step 6: Final answer
   x = 1,198.83