Finding the Fourth Proportional to 2,578.78, 3,869.88 and 1,118.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.78 : 3,869.88 = 1,118.08 : x
2. Step 2: Convert to fraction form
   2,578.78/3,869.88 = 1,118.08/x
3. Step 3: Cross multiply
   2,578.78x = 3,869.88 × 1,118.08
4. Step 4: Simplify right side
   2,578.78x = 4,326,835.43
5. Step 5: Solve for x
   x = 4,326,835.43/2,578.78
6. Step 6: Final answer
   x = 1,677.86