Finding the Fourth Proportional to 2,286.78, 3,157.30 and 1,728.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.78 : 3,157.30 = 1,728.42 : x
2. Step 2: Convert to fraction form
   2,286.78/3,157.30 = 1,728.42/x
3. Step 3: Cross multiply
   2,286.78x = 3,157.30 × 1,728.42
4. Step 4: Simplify right side
   2,286.78x = 5,457,140.47
5. Step 5: Solve for x
   x = 5,457,140.47/2,286.78
6. Step 6: Final answer
   x = 2,386.39