Finding the Fourth Proportional to 8,145.42, 12,224.61 and 3,216.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,145.42 : 12,224.61 = 3,216.30 : x
2. Step 2: Convert to fraction form
   8,145.42/12,224.61 = 3,216.30/x
3. Step 3: Cross multiply
   8,145.42x = 12,224.61 × 3,216.30
4. Step 4: Simplify right side
   8,145.42x = 39,318,013.14
5. Step 5: Solve for x
   x = 39,318,013.14/8,145.42
6. Step 6: Final answer
   x = 4,827.01