Finding the Fourth Proportional to 10,638.09, 15,960.41 and 5,447.61

Step by Step Solution

1. Step 1: Write the proportion equation
   10,638.09 : 15,960.41 = 5,447.61 : x
2. Step 2: Convert to fraction form
   10,638.09/15,960.41 = 5,447.61/x
3. Step 3: Cross multiply
   10,638.09x = 15,960.41 × 5,447.61
4. Step 4: Simplify right side
   10,638.09x = 86,946,061.88
5. Step 5: Solve for x
   x = 86,946,061.88/10,638.09
6. Step 6: Final answer
   x = 8,173.09