Finding the Fourth Proportional to 2,209.16, 3,315.72 and 1,659.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.16 : 3,315.72 = 1,659.68 : x
2. Step 2: Convert to fraction form
   2,209.16/3,315.72 = 1,659.68/x
3. Step 3: Cross multiply
   2,209.16x = 3,315.72 × 1,659.68
4. Step 4: Simplify right side
   2,209.16x = 5,503,034.17
5. Step 5: Solve for x
   x = 5,503,034.17/2,209.16
6. Step 6: Final answer
   x = 2,491.01