Finding the Fourth Proportional to 1,554.13, 2,144.69 and 855.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.13 : 2,144.69 = 855.55 : x
2. Step 2: Convert to fraction form
   1,554.13/2,144.69 = 855.55/x
3. Step 3: Cross multiply
   1,554.13x = 2,144.69 × 855.55
4. Step 4: Simplify right side
   1,554.13x = 1,834,889.53
5. Step 5: Solve for x
   x = 1,834,889.53/1,554.13
6. Step 6: Final answer
   x = 1,180.65