Finding the Fourth Proportional to 21,241.40, 29,308.76 and 12,285.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,241.40 : 29,308.76 = 12,285.62 : x
2. Step 2: Convert to fraction form
   21,241.40/29,308.76 = 12,285.62/x
3. Step 3: Cross multiply
   21,241.40x = 29,308.76 × 12,285.62
4. Step 4: Simplify right side
   21,241.40x = 360,076,288.03
5. Step 5: Solve for x
   x = 360,076,288.03/21,241.40
6. Step 6: Final answer
   x = 16,951.63