Finding the Fourth Proportional to 15,401.08, 21,243.90 and 9,109

Step by Step Solution

1. Step 1: Write the proportion equation
   15,401.08 : 21,243.90 = 9,109 : x
2. Step 2: Convert to fraction form
   15,401.08/21,243.90 = 9,109/x
3. Step 3: Cross multiply
   15,401.08x = 21,243.90 × 9,109
4. Step 4: Simplify right side
   15,401.08x = 193,510,685.10
5. Step 5: Solve for x
   x = 193,510,685.10/15,401.08
6. Step 6: Final answer
   x = 12,564.75