Finding the Fourth Proportional to 15,908.72, 21,942.96 and 12,924.56

Step by Step Solution

1. Step 1: Write the proportion equation
   15,908.72 : 21,942.96 = 12,924.56 : x
2. Step 2: Convert to fraction form
   15,908.72/21,942.96 = 12,924.56/x
3. Step 3: Cross multiply
   15,908.72x = 21,942.96 × 12,924.56
4. Step 4: Simplify right side
   15,908.72x = 283,603,103.10
5. Step 5: Solve for x
   x = 283,603,103.10/15,908.72
6. Step 6: Final answer
   x = 17,826.90