Finding the Fourth Proportional to 2,258.16, 3,115.76 and 1,513.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,258.16 : 3,115.76 = 1,513.20 : x
2. Step 2: Convert to fraction form
   2,258.16/3,115.76 = 1,513.20/x
3. Step 3: Cross multiply
   2,258.16x = 3,115.76 × 1,513.20
4. Step 4: Simplify right side
   2,258.16x = 4,714,768.03
5. Step 5: Solve for x
   x = 4,714,768.03/2,258.16
6. Step 6: Final answer
   x = 2,087.88