Finding the Fourth Proportional to 12,907.28, 17,820.50 and 8,940.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,907.28 : 17,820.50 = 8,940.56 : x
2. Step 2: Convert to fraction form
   12,907.28/17,820.50 = 8,940.56/x
3. Step 3: Cross multiply
   12,907.28x = 17,820.50 × 8,940.56
4. Step 4: Simplify right side
   12,907.28x = 159,325,249.48
5. Step 5: Solve for x
   x = 159,325,249.48/12,907.28
6. Step 6: Final answer
   x = 12,343.83