Finding the Fourth Proportional to 16,429.28, 22,672.56 and 9,355.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,429.28 : 22,672.56 = 9,355.60 : x
2. Step 2: Convert to fraction form
   16,429.28/22,672.56 = 9,355.60/x
3. Step 3: Cross multiply
   16,429.28x = 22,672.56 × 9,355.60
4. Step 4: Simplify right side
   16,429.28x = 212,115,402.34
5. Step 5: Solve for x
   x = 212,115,402.34/16,429.28
6. Step 6: Final answer
   x = 12,910.82