Finding the Fourth Proportional to 6,412.50, 8,849.34 and 3,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,412.50 : 8,849.34 = 3,928.50 : x
2. Step 2: Convert to fraction form
   6,412.50/8,849.34 = 3,928.50/x
3. Step 3: Cross multiply
   6,412.50x = 8,849.34 × 3,928.50
4. Step 4: Simplify right side
   6,412.50x = 34,764,632.19
5. Step 5: Solve for x
   x = 34,764,632.19/6,412.50
6. Step 6: Final answer
   x = 5,421.39