Finding the Fourth Proportional to 10,956.78, 16,443.12 and 4,384.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,956.78 : 16,443.12 = 4,384.80 : x
2. Step 2: Convert to fraction form
   10,956.78/16,443.12 = 4,384.80/x
3. Step 3: Cross multiply
   10,956.78x = 16,443.12 × 4,384.80
4. Step 4: Simplify right side
   10,956.78x = 72,099,792.58
5. Step 5: Solve for x
   x = 72,099,792.58/10,956.78
6. Step 6: Final answer
   x = 6,580.38