Finding the Fourth Proportional to 6,911.58, 9,538.72 and 3,928.15

Step by Step Solution

1. Step 1: Write the proportion equation
   6,911.58 : 9,538.72 = 3,928.15 : x
2. Step 2: Convert to fraction form
   6,911.58/9,538.72 = 3,928.15/x
3. Step 3: Cross multiply
   6,911.58x = 9,538.72 × 3,928.15
4. Step 4: Simplify right side
   6,911.58x = 37,469,489.30
5. Step 5: Solve for x
   x = 37,469,489.30/6,911.58
6. Step 6: Final answer
   x = 5,421.26