Finding the Fourth Proportional to 6,508.14, 8,978.91 and 3,989.34

Step by Step Solution

1. Step 1: Write the proportion equation
   6,508.14 : 8,978.91 = 3,989.34 : x
2. Step 2: Convert to fraction form
   6,508.14/8,978.91 = 3,989.34/x
3. Step 3: Cross multiply
   6,508.14x = 8,978.91 × 3,989.34
4. Step 4: Simplify right side
   6,508.14x = 35,819,924.82
5. Step 5: Solve for x
   x = 35,819,924.82/6,508.14
6. Step 6: Final answer
   x = 5,503.87