Finding the Fourth Proportional to 13,196.58, 18,211.28 and 7,228.46

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.58 : 18,211.28 = 7,228.46 : x
2. Step 2: Convert to fraction form
   13,196.58/18,211.28 = 7,228.46/x
3. Step 3: Cross multiply
   13,196.58x = 18,211.28 × 7,228.46
4. Step 4: Simplify right side
   13,196.58x = 131,639,555.56
5. Step 5: Solve for x
   x = 131,639,555.56/13,196.58
6. Step 6: Final answer
   x = 9,975.28