Finding the Fourth Proportional to 4,978.12, 6,867.57 and 3,209.08

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.12 : 6,867.57 = 3,209.08 : x
2. Step 2: Convert to fraction form
   4,978.12/6,867.57 = 3,209.08/x
3. Step 3: Cross multiply
   4,978.12x = 6,867.57 × 3,209.08
4. Step 4: Simplify right side
   4,978.12x = 22,038,581.54
5. Step 5: Solve for x
   x = 22,038,581.54/4,978.12
6. Step 6: Final answer
   x = 4,427.09