Finding the Fourth Proportional to 21,928.96, 30,262.72 and 11,992.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,928.96 : 30,262.72 = 11,992.96 : x
2. Step 2: Convert to fraction form
   21,928.96/30,262.72 = 11,992.96/x
3. Step 3: Cross multiply
   21,928.96x = 30,262.72 × 11,992.96
4. Step 4: Simplify right side
   21,928.96x = 362,939,590.45
5. Step 5: Solve for x
   x = 362,939,590.45/21,928.96
6. Step 6: Final answer
   x = 16,550.70