Finding the Fourth Proportional to 2,385.11, 3,289.82 and 1,678.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.11 : 3,289.82 = 1,678.46 : x
2. Step 2: Convert to fraction form
   2,385.11/3,289.82 = 1,678.46/x
3. Step 3: Cross multiply
   2,385.11x = 3,289.82 × 1,678.46
4. Step 4: Simplify right side
   2,385.11x = 5,521,806.44
5. Step 5: Solve for x
   x = 5,521,806.44/2,385.11
6. Step 6: Final answer
   x = 2,315.11