Finding the Fourth Proportional to 1,554.42, 2,145.06 and 855.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.42 : 2,145.06 = 855.75 : x
2. Step 2: Convert to fraction form
   1,554.42/2,145.06 = 855.75/x
3. Step 3: Cross multiply
   1,554.42x = 2,145.06 × 855.75
4. Step 4: Simplify right side
   1,554.42x = 1,835,635.10
5. Step 5: Solve for x
   x = 1,835,635.10/1,554.42
6. Step 6: Final answer
   x = 1,180.91