Finding the Fourth Proportional to 6,445.98, 8,896.50 and 3,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,445.98 : 8,896.50 = 3,928.50 : x
2. Step 2: Convert to fraction form
   6,445.98/8,896.50 = 3,928.50/x
3. Step 3: Cross multiply
   6,445.98x = 8,896.50 × 3,928.50
4. Step 4: Simplify right side
   6,445.98x = 34,949,900.25
5. Step 5: Solve for x
   x = 34,949,900.25/6,445.98
6. Step 6: Final answer
   x = 5,421.97