Finding the Fourth Proportional to 21,601.72, 29,814.24 and 12,648.70

Step by Step Solution

1. Step 1: Write the proportion equation
   21,601.72 : 29,814.24 = 12,648.70 : x
2. Step 2: Convert to fraction form
   21,601.72/29,814.24 = 12,648.70/x
3. Step 3: Cross multiply
   21,601.72x = 29,814.24 × 12,648.70
4. Step 4: Simplify right side
   21,601.72x = 377,111,377.49
5. Step 5: Solve for x
   x = 377,111,377.49/21,601.72
6. Step 6: Final answer
   x = 17,457.47