Finding the Fourth Proportional to 2,215.60, 3,315.60 and 1,518.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.60 : 3,315.60 = 1,518.96 : x
2. Step 2: Convert to fraction form
   2,215.60/3,315.60 = 1,518.96/x
3. Step 3: Cross multiply
   2,215.60x = 3,315.60 × 1,518.96
4. Step 4: Simplify right side
   2,215.60x = 5,036,263.78
5. Step 5: Solve for x
   x = 5,036,263.78/2,215.60
6. Step 6: Final answer
   x = 2,273.09