Finding the Fourth Proportional to 2,381.94, 3,286.08 and 1,386.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,381.94 : 3,286.08 = 1,386.72 : x
2. Step 2: Convert to fraction form
   2,381.94/3,286.08 = 1,386.72/x
3. Step 3: Cross multiply
   2,381.94x = 3,286.08 × 1,386.72
4. Step 4: Simplify right side
   2,381.94x = 4,556,872.86
5. Step 5: Solve for x
   x = 4,556,872.86/2,381.94
6. Step 6: Final answer
   x = 1,913.09