Finding the Fourth Proportional to 8,411.72, 12,609.54 and 3,145.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,411.72 : 12,609.54 = 3,145.30 : x
2. Step 2: Convert to fraction form
   8,411.72/12,609.54 = 3,145.30/x
3. Step 3: Cross multiply
   8,411.72x = 12,609.54 × 3,145.30
4. Step 4: Simplify right side
   8,411.72x = 39,660,754.64
5. Step 5: Solve for x
   x = 39,660,754.64/8,411.72
6. Step 6: Final answer
   x = 4,714.94