Finding the Fourth Proportional to 21,912.72, 30,240.72 and 12,484.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,912.72 : 30,240.72 = 12,484.32 : x
2. Step 2: Convert to fraction form
   21,912.72/30,240.72 = 12,484.32/x
3. Step 3: Cross multiply
   21,912.72x = 30,240.72 × 12,484.32
4. Step 4: Simplify right side
   21,912.72x = 377,534,825.51
5. Step 5: Solve for x
   x = 377,534,825.51/21,912.72
6. Step 6: Final answer
   x = 17,229.03