Finding the Fourth Proportional to 8,215.40, 12,321.89 and 3,020.06

Step by Step Solution

1. Step 1: Write the proportion equation
   8,215.40 : 12,321.89 = 3,020.06 : x
2. Step 2: Convert to fraction form
   8,215.40/12,321.89 = 3,020.06/x
3. Step 3: Cross multiply
   8,215.40x = 12,321.89 × 3,020.06
4. Step 4: Simplify right side
   8,215.40x = 37,212,874.14
5. Step 5: Solve for x
   x = 37,212,874.14/8,215.40
6. Step 6: Final answer
   x = 4,529.65