Finding the Fourth Proportional to 1,353.56, 1,867.20 and 855.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.56 : 1,867.20 = 855.34 : x
2. Step 2: Convert to fraction form
   1,353.56/1,867.20 = 855.34/x
3. Step 3: Cross multiply
   1,353.56x = 1,867.20 × 855.34
4. Step 4: Simplify right side
   1,353.56x = 1,597,090.85
5. Step 5: Solve for x
   x = 1,597,090.85/1,353.56
6. Step 6: Final answer
   x = 1,179.92