Finding the Fourth Proportional to 1,297.42, 1,789.89 and 855.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,297.42 : 1,789.89 = 855.22 : x
2. Step 2: Convert to fraction form
   1,297.42/1,789.89 = 855.22/x
3. Step 3: Cross multiply
   1,297.42x = 1,789.89 × 855.22
4. Step 4: Simplify right side
   1,297.42x = 1,530,749.73
5. Step 5: Solve for x
   x = 1,530,749.73/1,297.42
6. Step 6: Final answer
   x = 1,179.84