Finding the Fourth Proportional to 13,146.69, 18,142.37 and 7,178.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.69 : 18,142.37 = 7,178.36 : x
2. Step 2: Convert to fraction form
   13,146.69/18,142.37 = 7,178.36/x
3. Step 3: Cross multiply
   13,146.69x = 18,142.37 × 7,178.36
4. Step 4: Simplify right side
   13,146.69x = 130,232,336.51
5. Step 5: Solve for x
   x = 130,232,336.51/13,146.69
6. Step 6: Final answer
   x = 9,906.09