Finding the Fourth Proportional to 2,013.78, 2,779.56 and 1,315.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.78 : 2,779.56 = 1,315.14 : x
2. Step 2: Convert to fraction form
   2,013.78/2,779.56 = 1,315.14/x
3. Step 3: Cross multiply
   2,013.78x = 2,779.56 × 1,315.14
4. Step 4: Simplify right side
   2,013.78x = 3,655,510.54
5. Step 5: Solve for x
   x = 3,655,510.54/2,013.78
6. Step 6: Final answer
   x = 1,815.25