Finding the Fourth Proportional to 2,196.32, 3,291.60 and 1,618.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.32 : 3,291.60 = 1,618.40 : x
2. Step 2: Convert to fraction form
   2,196.32/3,291.60 = 1,618.40/x
3. Step 3: Cross multiply
   2,196.32x = 3,291.60 × 1,618.40
4. Step 4: Simplify right side
   2,196.32x = 5,327,125.44
5. Step 5: Solve for x
   x = 5,327,125.44/2,196.32
6. Step 6: Final answer
   x = 2,425.48