Finding the Fourth Proportional to 2,015.78, 3,018.78 and 1,397.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.78 : 3,018.78 = 1,397.75 : x
2. Step 2: Convert to fraction form
   2,015.78/3,018.78 = 1,397.75/x
3. Step 3: Cross multiply
   2,015.78x = 3,018.78 × 1,397.75
4. Step 4: Simplify right side
   2,015.78x = 4,219,499.75
5. Step 5: Solve for x
   x = 4,219,499.75/2,015.78
6. Step 6: Final answer
   x = 2,093.23