Finding the Fourth Proportional to 8,352.72, 12,528.72 and 3,420.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,352.72 : 12,528.72 = 3,420.72 : x
2. Step 2: Convert to fraction form
   8,352.72/12,528.72 = 3,420.72/x
3. Step 3: Cross multiply
   8,352.72x = 12,528.72 × 3,420.72
4. Step 4: Simplify right side
   8,352.72x = 42,857,243.08
5. Step 5: Solve for x
   x = 42,857,243.08/8,352.72
6. Step 6: Final answer
   x = 5,130.93