Finding the Fourth Proportional to 21,991.92, 30,348.72 and 12,559.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,991.92 : 30,348.72 = 12,559.92 : x
2. Step 2: Convert to fraction form
   21,991.92/30,348.72 = 12,559.92/x
3. Step 3: Cross multiply
   21,991.92x = 30,348.72 × 12,559.92
4. Step 4: Simplify right side
   21,991.92x = 381,177,495.30
5. Step 5: Solve for x
   x = 381,177,495.30/21,991.92
6. Step 6: Final answer
   x = 17,332.62