Finding the Fourth Proportional to 2,565.42, 3,540.28 and 1,386.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,565.42 : 3,540.28 = 1,386.49 : x
2. Step 2: Convert to fraction form
   2,565.42/3,540.28 = 1,386.49/x
3. Step 3: Cross multiply
   2,565.42x = 3,540.28 × 1,386.49
4. Step 4: Simplify right side
   2,565.42x = 4,908,573.59
5. Step 5: Solve for x
   x = 4,908,573.59/2,565.42
6. Step 6: Final answer
   x = 1,913.36