Finding the Fourth Proportional to 21,665.46, 29,897.96 and 12,105.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,665.46 : 29,897.96 = 12,105.54 : x
2. Step 2: Convert to fraction form
   21,665.46/29,897.96 = 12,105.54/x
3. Step 3: Cross multiply
   21,665.46x = 29,897.96 × 12,105.54
4. Step 4: Simplify right side
   21,665.46x = 361,930,801.21
5. Step 5: Solve for x
   x = 361,930,801.21/21,665.46
6. Step 6: Final answer
   x = 16,705.43