Finding the Fourth Proportional to 16,288.78, 22,478.60 and 9,215.05

Step by Step Solution

1. Step 1: Write the proportion equation
   16,288.78 : 22,478.60 = 9,215.05 : x
2. Step 2: Convert to fraction form
   16,288.78/22,478.60 = 9,215.05/x
3. Step 3: Cross multiply
   16,288.78x = 22,478.60 × 9,215.05
4. Step 4: Simplify right side
   16,288.78x = 207,141,422.93
5. Step 5: Solve for x
   x = 207,141,422.93/16,288.78
6. Step 6: Final answer
   x = 12,716.82