Finding the Fourth Proportional to 10,966.41, 16,440.38 and 4,389

Step by Step Solution

1. Step 1: Write the proportion equation
   10,966.41 : 16,440.38 = 4,389 : x
2. Step 2: Convert to fraction form
   10,966.41/16,440.38 = 4,389/x
3. Step 3: Cross multiply
   10,966.41x = 16,440.38 × 4,389
4. Step 4: Simplify right side
   10,966.41x = 72,156,827.82
5. Step 5: Solve for x
   x = 72,156,827.82/10,966.41
6. Step 6: Final answer
   x = 6,579.81