Finding the Fourth Proportional to 13,196.64, 18,211.91 and 7,228.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.64 : 18,211.91 = 7,228.83 : x
2. Step 2: Convert to fraction form
   13,196.64/18,211.91 = 7,228.83/x
3. Step 3: Cross multiply
   13,196.64x = 18,211.91 × 7,228.83
4. Step 4: Simplify right side
   13,196.64x = 131,650,765.22
5. Step 5: Solve for x
   x = 131,650,765.22/13,196.64
6. Step 6: Final answer
   x = 9,976.08