Finding the Fourth Proportional to 16,770.22, 23,141.78 and 9,216.39

Step by Step Solution

1. Step 1: Write the proportion equation
   16,770.22 : 23,141.78 = 9,216.39 : x
2. Step 2: Convert to fraction form
   16,770.22/23,141.78 = 9,216.39/x
3. Step 3: Cross multiply
   16,770.22x = 23,141.78 × 9,216.39
4. Step 4: Simplify right side
   16,770.22x = 213,283,507.98
5. Step 5: Solve for x
   x = 213,283,507.98/16,770.22
6. Step 6: Final answer
   x = 12,717.99