Finding the Fourth Proportional to 19,128.72, 28,639.62 and 10,332.12

Step by Step Solution

1. Step 1: Write the proportion equation
   19,128.72 : 28,639.62 = 10,332.12 : x
2. Step 2: Convert to fraction form
   19,128.72/28,639.62 = 10,332.12/x
3. Step 3: Cross multiply
   19,128.72x = 28,639.62 × 10,332.12
4. Step 4: Simplify right side
   19,128.72x = 295,907,990.59
5. Step 5: Solve for x
   x = 295,907,990.59/19,128.72
6. Step 6: Final answer
   x = 15,469.30