Finding the Fourth Proportional to 21,725.70, 29,983.41 and 12,768.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,725.70 : 29,983.41 = 12,768.72 : x
2. Step 2: Convert to fraction form
   21,725.70/29,983.41 = 12,768.72/x
3. Step 3: Cross multiply
   21,725.70x = 29,983.41 × 12,768.72
4. Step 4: Simplify right side
   21,725.70x = 382,849,766.94
5. Step 5: Solve for x
   x = 382,849,766.94/21,725.70
6. Step 6: Final answer
   x = 17,621.98