Finding the Fourth Proportional to 1,857.69, 2,563.59 and 1,018.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,857.69 : 2,563.59 = 1,018.40 : x
2. Step 2: Convert to fraction form
   1,857.69/2,563.59 = 1,018.40/x
3. Step 3: Cross multiply
   1,857.69x = 2,563.59 × 1,018.40
4. Step 4: Simplify right side
   1,857.69x = 2,610,760.06
5. Step 5: Solve for x
   x = 2,610,760.06/1,857.69
6. Step 6: Final answer
   x = 1,405.38