Finding the Fourth Proportional to 22,528.72, 31,089.84 and 12,456.64

Step by Step Solution

1. Step 1: Write the proportion equation
   22,528.72 : 31,089.84 = 12,456.64 : x
2. Step 2: Convert to fraction form
   22,528.72/31,089.84 = 12,456.64/x
3. Step 3: Cross multiply
   22,528.72x = 31,089.84 × 12,456.64
4. Step 4: Simplify right side
   22,528.72x = 387,274,944.54
5. Step 5: Solve for x
   x = 387,274,944.54/22,528.72
6. Step 6: Final answer
   x = 17,190.28