Finding the Fourth Proportional to 1,553.69, 2,144.12 and 855.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.69 : 2,144.12 = 855.06 : x
2. Step 2: Convert to fraction form
   1,553.69/2,144.12 = 855.06/x
3. Step 3: Cross multiply
   1,553.69x = 2,144.12 × 855.06
4. Step 4: Simplify right side
   1,553.69x = 1,833,358.75
5. Step 5: Solve for x
   x = 1,833,358.75/1,553.69
6. Step 6: Final answer
   x = 1,180.00