Finding the Fourth Proportional to 1,578.83, 2,366.89 and 1,115.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.83 : 2,366.89 = 1,115.15 : x
2. Step 2: Convert to fraction form
   1,578.83/2,366.89 = 1,115.15/x
3. Step 3: Cross multiply
   1,578.83x = 2,366.89 × 1,115.15
4. Step 4: Simplify right side
   1,578.83x = 2,639,422.76
5. Step 5: Solve for x
   x = 2,639,422.76/1,578.83
6. Step 6: Final answer
   x = 1,671.76