Finding the Fourth Proportional to 6,978.36, 9,628.78 and 4,458.53

Step by Step Solution

1. Step 1: Write the proportion equation
   6,978.36 : 9,628.78 = 4,458.53 : x
2. Step 2: Convert to fraction form
   6,978.36/9,628.78 = 4,458.53/x
3. Step 3: Cross multiply
   6,978.36x = 9,628.78 × 4,458.53
4. Step 4: Simplify right side
   6,978.36x = 42,930,217.42
5. Step 5: Solve for x
   x = 42,930,217.42/6,978.36
6. Step 6: Final answer
   x = 6,151.91