Finding the Fourth Proportional to 10,988.46, 15,150.24 and 9,216.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,988.46 : 15,150.24 = 9,216.18 : x
2. Step 2: Convert to fraction form
   10,988.46/15,150.24 = 9,216.18/x
3. Step 3: Cross multiply
   10,988.46x = 15,150.24 × 9,216.18
4. Step 4: Simplify right side
   10,988.46x = 139,627,338.88
5. Step 5: Solve for x
   x = 139,627,338.88/10,988.46
6. Step 6: Final answer
   x = 12,706.72