Finding the Fourth Proportional to 13,200.15, 18,216.23 and 7,231.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.15 : 18,216.23 = 7,231.69 : x
2. Step 2: Convert to fraction form
   13,200.15/18,216.23 = 7,231.69/x
3. Step 3: Cross multiply
   13,200.15x = 18,216.23 × 7,231.69
4. Step 4: Simplify right side
   13,200.15x = 131,734,128.33
5. Step 5: Solve for x
   x = 131,734,128.33/13,200.15
6. Step 6: Final answer
   x = 9,979.74