Finding the Fourth Proportional to 13,200.40, 18,216.58 and 7,231.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.40 : 18,216.58 = 7,231.94 : x
2. Step 2: Convert to fraction form
   13,200.40/18,216.58 = 7,231.94/x
3. Step 3: Cross multiply
   13,200.40x = 18,216.58 × 7,231.94
4. Step 4: Simplify right side
   13,200.40x = 131,741,213.57
5. Step 5: Solve for x
   x = 131,741,213.57/13,200.40
6. Step 6: Final answer
   x = 9,980.09