Finding the Fourth Proportional to 1,554.19, 2,144.78 and 855.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.19 : 2,144.78 = 855.56 : x
2. Step 2: Convert to fraction form
   1,554.19/2,144.78 = 855.56/x
3. Step 3: Cross multiply
   1,554.19x = 2,144.78 × 855.56
4. Step 4: Simplify right side
   1,554.19x = 1,834,992.27
5. Step 5: Solve for x
   x = 1,834,992.27/1,554.19
6. Step 6: Final answer
   x = 1,180.68