Finding the Fourth Proportional to 16,428.89, 22,672.08 and 9,355.34

Step by Step Solution

1. Step 1: Write the proportion equation
   16,428.89 : 22,672.08 = 9,355.34 : x
2. Step 2: Convert to fraction form
   16,428.89/22,672.08 = 9,355.34/x
3. Step 3: Cross multiply
   16,428.89x = 22,672.08 × 9,355.34
4. Step 4: Simplify right side
   16,428.89x = 212,104,903.55
5. Step 5: Solve for x
   x = 212,104,903.55/16,428.89
6. Step 6: Final answer
   x = 12,910.49