Finding the Fourth Proportional to 13,146.37, 18,142.42 and 7,178.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.37 : 18,142.42 = 7,178.49 : x
2. Step 2: Convert to fraction form
   13,146.37/18,142.42 = 7,178.49/x
3. Step 3: Cross multiply
   13,146.37x = 18,142.42 × 7,178.49
4. Step 4: Simplify right side
   13,146.37x = 130,235,162.60
5. Step 5: Solve for x
   x = 130,235,162.60/13,146.37
6. Step 6: Final answer
   x = 9,906.55