Finding the Fourth Proportional to 13,196.70, 18,211.46 and 7,228.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.70 : 18,211.46 = 7,228.37 : x
2. Step 2: Convert to fraction form
   13,196.70/18,211.46 = 7,228.37/x
3. Step 3: Cross multiply
   13,196.70x = 18,211.46 × 7,228.37
4. Step 4: Simplify right side
   13,196.70x = 131,639,180.51
5. Step 5: Solve for x
   x = 131,639,180.51/13,196.70
6. Step 6: Final answer
   x = 9,975.16