Finding the Fourth Proportional to 8,143.83, 12,215.86 and 3,213.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,143.83 : 12,215.86 = 3,213.42 : x
2. Step 2: Convert to fraction form
   8,143.83/12,215.86 = 3,213.42/x
3. Step 3: Cross multiply
   8,143.83x = 12,215.86 × 3,213.42
4. Step 4: Simplify right side
   8,143.83x = 39,254,721.79
5. Step 5: Solve for x
   x = 39,254,721.79/8,143.83
6. Step 6: Final answer
   x = 4,820.18