Finding the Fourth Proportional to 4,143.92, 6,215.89 and 1,678.78

Step by Step Solution

1. Step 1: Write the proportion equation
   4,143.92 : 6,215.89 = 1,678.78 : x
2. Step 2: Convert to fraction form
   4,143.92/6,215.89 = 1,678.78/x
3. Step 3: Cross multiply
   4,143.92x = 6,215.89 × 1,678.78
4. Step 4: Simplify right side
   4,143.92x = 10,435,111.81
5. Step 5: Solve for x
   x = 10,435,111.81/4,143.92
6. Step 6: Final answer
   x = 2,518.18