Finding the Fourth Proportional to 13,200.48, 18,215.71 and 7,231.19

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.48 : 18,215.71 = 7,231.19 : x
2. Step 2: Convert to fraction form
   13,200.48/18,215.71 = 7,231.19/x
3. Step 3: Cross multiply
   13,200.48x = 18,215.71 × 7,231.19
4. Step 4: Simplify right side
   13,200.48x = 131,721,132.76
5. Step 5: Solve for x
   x = 131,721,132.76/13,200.48
6. Step 6: Final answer
   x = 9,978.51