Finding the Fourth Proportional to 22,664, 31,276.32 and 12,728

Step by Step Solution

1. Step 1: Write the proportion equation
   22,664 : 31,276.32 = 12,728 : x
2. Step 2: Convert to fraction form
   22,664/31,276.32 = 12,728/x
3. Step 3: Cross multiply
   22,664x = 31,276.32 × 12,728
4. Step 4: Simplify right side
   22,664x = 398,085,000.96
5. Step 5: Solve for x
   x = 398,085,000.96/22,664
6. Step 6: Final answer
   x = 17,564.64