Finding the Fourth Proportional to 2,387.18, 3,578.94 and 1,087.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.18 : 3,578.94 = 1,087.13 : x
2. Step 2: Convert to fraction form
   2,387.18/3,578.94 = 1,087.13/x
3. Step 3: Cross multiply
   2,387.18x = 3,578.94 × 1,087.13
4. Step 4: Simplify right side
   2,387.18x = 3,890,755.15
5. Step 5: Solve for x
   x = 3,890,755.15/2,387.18
6. Step 6: Final answer
   x = 1,629.86