Finding the Fourth Proportional to 13,148.57, 18,145.59 and 7,180.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,148.57 : 18,145.59 = 7,180.49 : x
2. Step 2: Convert to fraction form
   13,148.57/18,145.59 = 7,180.49/x
3. Step 3: Cross multiply
   13,148.57x = 18,145.59 × 7,180.49
4. Step 4: Simplify right side
   13,148.57x = 130,294,227.54
5. Step 5: Solve for x
   x = 130,294,227.54/13,148.57
6. Step 6: Final answer
   x = 9,909.38