Finding the Fourth Proportional to 16,308.36, 22,505.89 and 9,138.81

Step by Step Solution

1. Step 1: Write the proportion equation
   16,308.36 : 22,505.89 = 9,138.81 : x
2. Step 2: Convert to fraction form
   16,308.36/22,505.89 = 9,138.81/x
3. Step 3: Cross multiply
   16,308.36x = 22,505.89 × 9,138.81
4. Step 4: Simplify right side
   16,308.36x = 205,676,940.06
5. Step 5: Solve for x
   x = 205,676,940.06/16,308.36
6. Step 6: Final answer
   x = 12,611.75