Finding the Fourth Proportional to 22,118.64, 30,523.42 and 12,687

Step by Step Solution

1. Step 1: Write the proportion equation
   22,118.64 : 30,523.42 = 12,687 : x
2. Step 2: Convert to fraction form
   22,118.64/30,523.42 = 12,687/x
3. Step 3: Cross multiply
   22,118.64x = 30,523.42 × 12,687
4. Step 4: Simplify right side
   22,118.64x = 387,250,629.54
5. Step 5: Solve for x
   x = 387,250,629.54/22,118.64
6. Step 6: Final answer
   x = 17,507.89