Finding the Fourth Proportional to 2,385.18, 3,578.09 and 1,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.18 : 3,578.09 = 1,086.78 : x
2. Step 2: Convert to fraction form
   2,385.18/3,578.09 = 1,086.78/x
3. Step 3: Cross multiply
   2,385.18x = 3,578.09 × 1,086.78
4. Step 4: Simplify right side
   2,385.18x = 3,888,596.65
5. Step 5: Solve for x
   x = 3,888,596.65/2,385.18
6. Step 6: Final answer
   x = 1,630.32