Finding the Fourth Proportional to 21,581.76, 29,783.82 and 12,150.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,581.76 : 29,783.82 = 12,150.96 : x
2. Step 2: Convert to fraction form
   21,581.76/29,783.82 = 12,150.96/x
3. Step 3: Cross multiply
   21,581.76x = 29,783.82 × 12,150.96
4. Step 4: Simplify right side
   21,581.76x = 361,902,005.47
5. Step 5: Solve for x
   x = 361,902,005.47/21,581.76
6. Step 6: Final answer
   x = 16,768.88