Finding the Fourth Proportional to 8,384.79, 12,578.81 and 2,839.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,384.79 : 12,578.81 = 2,839.05 : x
2. Step 2: Convert to fraction form
   8,384.79/12,578.81 = 2,839.05/x
3. Step 3: Cross multiply
   8,384.79x = 12,578.81 × 2,839.05
4. Step 4: Simplify right side
   8,384.79x = 35,711,870.53
5. Step 5: Solve for x
   x = 35,711,870.53/8,384.79
6. Step 6: Final answer
   x = 4,259.13