Finding the Fourth Proportional to 12,411.75, 17,142.84 and 8,212.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,411.75 : 17,142.84 = 8,212.71 : x
2. Step 2: Convert to fraction form
   12,411.75/17,142.84 = 8,212.71/x
3. Step 3: Cross multiply
   12,411.75x = 17,142.84 × 8,212.71
4. Step 4: Simplify right side
   12,411.75x = 140,789,173.50
5. Step 5: Solve for x
   x = 140,789,173.50/12,411.75
6. Step 6: Final answer
   x = 11,343.22