Finding the Fourth Proportional to 13,146.39, 18,141.62 and 7,178.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.39 : 18,141.62 = 7,178.10 : x
2. Step 2: Convert to fraction form
   13,146.39/18,141.62 = 7,178.10/x
3. Step 3: Cross multiply
   13,146.39x = 18,141.62 × 7,178.10
4. Step 4: Simplify right side
   13,146.39x = 130,222,326.63
5. Step 5: Solve for x
   x = 130,222,326.63/13,146.39
6. Step 6: Final answer
   x = 9,905.56