Finding the Fourth Proportional to 10,889.89, 16,334.85 and 7,215.46

Step by Step Solution

1. Step 1: Write the proportion equation
   10,889.89 : 16,334.85 = 7,215.46 : x
2. Step 2: Convert to fraction form
   10,889.89/16,334.85 = 7,215.46/x
3. Step 3: Cross multiply
   10,889.89x = 16,334.85 × 7,215.46
4. Step 4: Simplify right side
   10,889.89x = 117,863,456.78
5. Step 5: Solve for x
   x = 117,863,456.78/10,889.89
6. Step 6: Final answer
   x = 10,823.20