Finding the Fourth Proportional to 15,144.18, 20,901.72 and 9,180.96

Step by Step Solution

1. Step 1: Write the proportion equation
   15,144.18 : 20,901.72 = 9,180.96 : x
2. Step 2: Convert to fraction form
   15,144.18/20,901.72 = 9,180.96/x
3. Step 3: Cross multiply
   15,144.18x = 20,901.72 × 9,180.96
4. Step 4: Simplify right side
   15,144.18x = 191,897,855.25
5. Step 5: Solve for x
   x = 191,897,855.25/15,144.18
6. Step 6: Final answer
   x = 12,671.39