Finding the Fourth Proportional to 12,439.37, 17,142.49 and 7,955.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439.37 : 17,142.49 = 7,955.31 : x
2. Step 2: Convert to fraction form
   12,439.37/17,142.49 = 7,955.31/x
3. Step 3: Cross multiply
   12,439.37x = 17,142.49 × 7,955.31
4. Step 4: Simplify right side
   12,439.37x = 136,373,851.60
5. Step 5: Solve for x
   x = 136,373,851.60/12,439.37
6. Step 6: Final answer
   x = 10,963.08