Finding the Fourth Proportional to 15,142.24, 20,907.55 and 9,181.98

Step by Step Solution

1. Step 1: Write the proportion equation
   15,142.24 : 20,907.55 = 9,181.98 : x
2. Step 2: Convert to fraction form
   15,142.24/20,907.55 = 9,181.98/x
3. Step 3: Cross multiply
   15,142.24x = 20,907.55 × 9,181.98
4. Step 4: Simplify right side
   15,142.24x = 191,972,756.86
5. Step 5: Solve for x
   x = 191,972,756.86/15,142.24
6. Step 6: Final answer
   x = 12,677.96