Finding the Fourth Proportional to 21,262.78, 29,336.76 and 12,308.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,262.78 : 29,336.76 = 12,308.56 : x
2. Step 2: Convert to fraction form
   21,262.78/29,336.76 = 12,308.56/x
3. Step 3: Cross multiply
   21,262.78x = 29,336.76 × 12,308.56
4. Step 4: Simplify right side
   21,262.78x = 361,093,270.67
5. Step 5: Solve for x
   x = 361,093,270.67/21,262.78
6. Step 6: Final answer
   x = 16,982.41