Finding the Fourth Proportional to 1,554.21, 2,144.77 and 855.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.21 : 2,144.77 = 855.59 : x
2. Step 2: Convert to fraction form
   1,554.21/2,144.77 = 855.59/x
3. Step 3: Cross multiply
   1,554.21x = 2,144.77 × 855.59
4. Step 4: Simplify right side
   1,554.21x = 1,835,030.90
5. Step 5: Solve for x
   x = 1,835,030.90/1,554.21
6. Step 6: Final answer
   x = 1,180.68