Finding the Fourth Proportional to 2,615.20, 3,609.30 and 1,620.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.20 : 3,609.30 = 1,620.79 : x
2. Step 2: Convert to fraction form
   2,615.20/3,609.30 = 1,620.79/x
3. Step 3: Cross multiply
   2,615.20x = 3,609.30 × 1,620.79
4. Step 4: Simplify right side
   2,615.20x = 5,849,917.35
5. Step 5: Solve for x
   x = 5,849,917.35/2,615.20
6. Step 6: Final answer
   x = 2,236.89