Finding the Fourth Proportional to 21,828.42, 30,123.18 and 11,892.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,828.42 : 30,123.18 = 11,892.42 : x
2. Step 2: Convert to fraction form
   21,828.42/30,123.18 = 11,892.42/x
3. Step 3: Cross multiply
   21,828.42x = 30,123.18 × 11,892.42
4. Step 4: Simplify right side
   21,828.42x = 358,237,508.30
5. Step 5: Solve for x
   x = 358,237,508.30/21,828.42
6. Step 6: Final answer
   x = 16,411.52