Finding the Fourth Proportional to 6,280.69, 8,667.39 and 3,924.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,280.69 : 8,667.39 = 3,924.20 : x
2. Step 2: Convert to fraction form
   6,280.69/8,667.39 = 3,924.20/x
3. Step 3: Cross multiply
   6,280.69x = 8,667.39 × 3,924.20
4. Step 4: Simplify right side
   6,280.69x = 34,012,571.84
5. Step 5: Solve for x
   x = 34,012,571.84/6,280.69
6. Step 6: Final answer
   x = 5,415.42