Finding the Fourth Proportional to 6,288.78, 8,678.55 and 3,494.28

Step by Step Solution

1. Step 1: Write the proportion equation
   6,288.78 : 8,678.55 = 3,494.28 : x
2. Step 2: Convert to fraction form
   6,288.78/8,678.55 = 3,494.28/x
3. Step 3: Cross multiply
   6,288.78x = 8,678.55 × 3,494.28
4. Step 4: Simplify right side
   6,288.78x = 30,325,283.69
5. Step 5: Solve for x
   x = 30,325,283.69/6,288.78
6. Step 6: Final answer
   x = 4,822.13