Finding the Fourth Proportional to 21,826.71, 30,123.42 and 12,266.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,826.71 : 30,123.42 = 12,266.61 : x
2. Step 2: Convert to fraction form
   21,826.71/30,123.42 = 12,266.61/x
3. Step 3: Cross multiply
   21,826.71x = 30,123.42 × 12,266.61
4. Step 4: Simplify right side
   21,826.71x = 369,512,245.01
5. Step 5: Solve for x
   x = 369,512,245.01/21,826.71
6. Step 6: Final answer
   x = 16,929.36