Finding the Fourth Proportional to 2,196.80, 3,290.40 and 1,099.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.80 : 3,290.40 = 1,099.25 : x
2. Step 2: Convert to fraction form
   2,196.80/3,290.40 = 1,099.25/x
3. Step 3: Cross multiply
   2,196.80x = 3,290.40 × 1,099.25
4. Step 4: Simplify right side
   2,196.80x = 3,616,955.75
5. Step 5: Solve for x
   x = 3,616,955.75/2,196.80
6. Step 6: Final answer
   x = 1,646.47