Finding the Fourth Proportional to 1,381.42, 2,081.49 and 1,143.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.42 : 2,081.49 = 1,143.28 : x
2. Step 2: Convert to fraction form
   1,381.42/2,081.49 = 1,143.28/x
3. Step 3: Cross multiply
   1,381.42x = 2,081.49 × 1,143.28
4. Step 4: Simplify right side
   1,381.42x = 2,379,725.89
5. Step 5: Solve for x
   x = 2,379,725.89/1,381.42
6. Step 6: Final answer
   x = 1,722.67