Finding the Fourth Proportional to 1,815.46, 2,505.39 and 1,018.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.46 : 2,505.39 = 1,018.78 : x
2. Step 2: Convert to fraction form
   1,815.46/2,505.39 = 1,018.78/x
3. Step 3: Cross multiply
   1,815.46x = 2,505.39 × 1,018.78
4. Step 4: Simplify right side
   1,815.46x = 2,552,441.22
5. Step 5: Solve for x
   x = 2,552,441.22/1,815.46
6. Step 6: Final answer
   x = 1,405.95