Finding the Fourth Proportional to 13,148.64, 18,144.61 and 7,180.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,148.64 : 18,144.61 = 7,180.31 : x
2. Step 2: Convert to fraction form
   13,148.64/18,144.61 = 7,180.31/x
3. Step 3: Cross multiply
   13,148.64x = 18,144.61 × 7,180.31
4. Step 4: Simplify right side
   13,148.64x = 130,283,952.04
5. Step 5: Solve for x
   x = 130,283,952.04/13,148.64
6. Step 6: Final answer
   x = 9,908.55