Finding the Fourth Proportional to 16,665.21, 22,998.55 and 9,111.38

Step by Step Solution

1. Step 1: Write the proportion equation
   16,665.21 : 22,998.55 = 9,111.38 : x
2. Step 2: Convert to fraction form
   16,665.21/22,998.55 = 9,111.38/x
3. Step 3: Cross multiply
   16,665.21x = 22,998.55 × 9,111.38
4. Step 4: Simplify right side
   16,665.21x = 209,548,528.50
5. Step 5: Solve for x
   x = 209,548,528.50/16,665.21
6. Step 6: Final answer
   x = 12,574.01