Finding the Fourth Proportional to 1,019.30, 1,404.12 and 869.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.30 : 1,404.12 = 869.44 : x
2. Step 2: Convert to fraction form
   1,019.30/1,404.12 = 869.44/x
3. Step 3: Cross multiply
   1,019.30x = 1,404.12 × 869.44
4. Step 4: Simplify right side
   1,019.30x = 1,220,786.73
5. Step 5: Solve for x
   x = 1,220,786.73/1,019.30
6. Step 6: Final answer
   x = 1,197.67