Finding the Fourth Proportional to 21,581.86, 29,783.55 and 12,150.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,581.86 : 29,783.55 = 12,150.76 : x
2. Step 2: Convert to fraction form
   21,581.86/29,783.55 = 12,150.76/x
3. Step 3: Cross multiply
   21,581.86x = 29,783.55 × 12,150.76
4. Step 4: Simplify right side
   21,581.86x = 361,892,768.00
5. Step 5: Solve for x
   x = 361,892,768.00/21,581.86
6. Step 6: Final answer
   x = 16,768.38