Finding the Fourth Proportional to 1,198.55, 1,654.55 and 800.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,198.55 : 1,654.55 = 800.87 : x
2. Step 2: Convert to fraction form
   1,198.55/1,654.55 = 800.87/x
3. Step 3: Cross multiply
   1,198.55x = 1,654.55 × 800.87
4. Step 4: Simplify right side
   1,198.55x = 1,325,067.18
5. Step 5: Solve for x
   x = 1,325,067.18/1,198.55
6. Step 6: Final answer
   x = 1,105.56