Finding the Fourth Proportional to 2,212.80, 3,321.90 and 2,196.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.80 : 3,321.90 = 2,196.60 : x
2. Step 2: Convert to fraction form
   2,212.80/3,321.90 = 2,196.60/x
3. Step 3: Cross multiply
   2,212.80x = 3,321.90 × 2,196.60
4. Step 4: Simplify right side
   2,212.80x = 7,296,885.54
5. Step 5: Solve for x
   x = 7,296,885.54/2,212.80
6. Step 6: Final answer
   x = 3,297.58