Finding the Fourth Proportional to 1,353.55, 1,869.03 and 857.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.55 : 1,869.03 = 857.06 : x
2. Step 2: Convert to fraction form
   1,353.55/1,869.03 = 857.06/x
3. Step 3: Cross multiply
   1,353.55x = 1,869.03 × 857.06
4. Step 4: Simplify right side
   1,353.55x = 1,601,870.85
5. Step 5: Solve for x
   x = 1,601,870.85/1,353.55
6. Step 6: Final answer
   x = 1,183.46