Finding the Fourth Proportional to 22,608, 31,199.10 and 12,672

Step by Step Solution

1. Step 1: Write the proportion equation
   22,608 : 31,199.10 = 12,672 : x
2. Step 2: Convert to fraction form
   22,608/31,199.10 = 12,672/x
3. Step 3: Cross multiply
   22,608x = 31,199.10 × 12,672
4. Step 4: Simplify right side
   22,608x = 395,354,995.20
5. Step 5: Solve for x
   x = 395,354,995.20/22,608
6. Step 6: Final answer
   x = 17,487.39