Finding the Fourth Proportional to 12,399.48, 17,109.36 and 7,927.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.48 : 17,109.36 = 7,927.20 : x
2. Step 2: Convert to fraction form
   12,399.48/17,109.36 = 7,927.20/x
3. Step 3: Cross multiply
   12,399.48x = 17,109.36 × 7,927.20
4. Step 4: Simplify right side
   12,399.48x = 135,629,318.59
5. Step 5: Solve for x
   x = 135,629,318.59/12,399.48
6. Step 6: Final answer
   x = 10,938.31