Finding the Fourth Proportional to 1,353.20, 1,866.80 and 955.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.20 : 1,866.80 = 955.43 : x
2. Step 2: Convert to fraction form
   1,353.20/1,866.80 = 955.43/x
3. Step 3: Cross multiply
   1,353.20x = 1,866.80 × 955.43
4. Step 4: Simplify right side
   1,353.20x = 1,783,596.78
5. Step 5: Solve for x
   x = 1,783,596.78/1,353.20
6. Step 6: Final answer
   x = 1,318.06