Finding the Fourth Proportional to 2,641.82, 3,945.38 and 2,122.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.82 : 3,945.38 = 2,122.61 : x
2. Step 2: Convert to fraction form
   2,641.82/3,945.38 = 2,122.61/x
3. Step 3: Cross multiply
   2,641.82x = 3,945.38 × 2,122.61
4. Step 4: Simplify right side
   2,641.82x = 8,374,472.70
5. Step 5: Solve for x
   x = 8,374,472.70/2,641.82
6. Step 6: Final answer
   x = 3,169.97