Finding the Fourth Proportional to 21,394.42, 29,520.72 and 12,442.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,394.42 : 29,520.72 = 12,442.30 : x
2. Step 2: Convert to fraction form
   21,394.42/29,520.72 = 12,442.30/x
3. Step 3: Cross multiply
   21,394.42x = 29,520.72 × 12,442.30
4. Step 4: Simplify right side
   21,394.42x = 367,305,654.46
5. Step 5: Solve for x
   x = 367,305,654.46/21,394.42
6. Step 6: Final answer
   x = 17,168.29