Finding the Fourth Proportional to 21,456.72, 29,611.49 and 12,025.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,456.72 : 29,611.49 = 12,025.89 : x
2. Step 2: Convert to fraction form
   21,456.72/29,611.49 = 12,025.89/x
3. Step 3: Cross multiply
   21,456.72x = 29,611.49 × 12,025.89
4. Step 4: Simplify right side
   21,456.72x = 356,104,521.48
5. Step 5: Solve for x
   x = 356,104,521.48/21,456.72
6. Step 6: Final answer
   x = 16,596.41