Finding the Fourth Proportional to 8,428.56, 12,645.72 and 3,164.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,428.56 : 12,645.72 = 3,164.28 : x
2. Step 2: Convert to fraction form
   8,428.56/12,645.72 = 3,164.28/x
3. Step 3: Cross multiply
   8,428.56x = 12,645.72 × 3,164.28
4. Step 4: Simplify right side
   8,428.56x = 40,014,598.88
5. Step 5: Solve for x
   x = 40,014,598.88/8,428.56
6. Step 6: Final answer
   x = 4,747.50