Finding the Fourth Proportional to 6,978.32, 9,628.56 and 3,995.09

Step by Step Solution

1. Step 1: Write the proportion equation
   6,978.32 : 9,628.56 = 3,995.09 : x
2. Step 2: Convert to fraction form
   6,978.32/9,628.56 = 3,995.09/x
3. Step 3: Cross multiply
   6,978.32x = 9,628.56 × 3,995.09
4. Step 4: Simplify right side
   6,978.32x = 38,466,915.63
5. Step 5: Solve for x
   x = 38,466,915.63/6,978.32
6. Step 6: Final answer
   x = 5,512.35