Finding the Fourth Proportional to 12,411.25, 17,142.15 and 8,212.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,411.25 : 17,142.15 = 8,212.21 : x
2. Step 2: Convert to fraction form
   12,411.25/17,142.15 = 8,212.21/x
3. Step 3: Cross multiply
   12,411.25x = 17,142.15 × 8,212.21
4. Step 4: Simplify right side
   12,411.25x = 140,774,935.65
5. Step 5: Solve for x
   x = 140,774,935.65/12,411.25
6. Step 6: Final answer
   x = 11,342.53