Finding the Fourth Proportional to 16,288.88, 22,478.67 and 9,215.15

Step by Step Solution

1. Step 1: Write the proportion equation
   16,288.88 : 22,478.67 = 9,215.15 : x
2. Step 2: Convert to fraction form
   16,288.88/22,478.67 = 9,215.15/x
3. Step 3: Cross multiply
   16,288.88x = 22,478.67 × 9,215.15
4. Step 4: Simplify right side
   16,288.88x = 207,144,203.46
5. Step 5: Solve for x
   x = 207,144,203.46/16,288.88
6. Step 6: Final answer
   x = 12,716.91