Finding the Fourth Proportional to 10,929.84, 16,398 and 3,138.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,929.84 : 16,398 = 3,138.72 : x
2. Step 2: Convert to fraction form
   10,929.84/16,398 = 3,138.72/x
3. Step 3: Cross multiply
   10,929.84x = 16,398 × 3,138.72
4. Step 4: Simplify right side
   10,929.84x = 51,468,730.56
5. Step 5: Solve for x
   x = 51,468,730.56/10,929.84
6. Step 6: Final answer
   x = 4,709.01