Finding the Fourth Proportional to 1,578.83, 2,176.74 and 1,018.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.83 : 2,176.74 = 1,018.31 : x
2. Step 2: Convert to fraction form
   1,578.83/2,176.74 = 1,018.31/x
3. Step 3: Cross multiply
   1,578.83x = 2,176.74 × 1,018.31
4. Step 4: Simplify right side
   1,578.83x = 2,216,585.23
5. Step 5: Solve for x
   x = 2,216,585.23/1,578.83
6. Step 6: Final answer
   x = 1,403.95