Finding the Fourth Proportional to 6,912.34, 9,539.83 and 3,928.70

Step by Step Solution

1. Step 1: Write the proportion equation
   6,912.34 : 9,539.83 = 3,928.70 : x
2. Step 2: Convert to fraction form
   6,912.34/9,539.83 = 3,928.70/x
3. Step 3: Cross multiply
   6,912.34x = 9,539.83 × 3,928.70
4. Step 4: Simplify right side
   6,912.34x = 37,479,136.78
5. Step 5: Solve for x
   x = 37,479,136.78/6,912.34
6. Step 6: Final answer
   x = 5,422.06