Finding the Fourth Proportional to 1,548.69, 2,321.24 and 855.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,548.69 : 2,321.24 = 855.78 : x
2. Step 2: Convert to fraction form
   1,548.69/2,321.24 = 855.78/x
3. Step 3: Cross multiply
   1,548.69x = 2,321.24 × 855.78
4. Step 4: Simplify right side
   1,548.69x = 1,986,466.49
5. Step 5: Solve for x
   x = 1,986,466.49/1,548.69
6. Step 6: Final answer
   x = 1,282.68