Finding the Fourth Proportional to 1,513.56, 2,271.18 and 820.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.56 : 2,271.18 = 820.20 : x
2. Step 2: Convert to fraction form
   1,513.56/2,271.18 = 820.20/x
3. Step 3: Cross multiply
   1,513.56x = 2,271.18 × 820.20
4. Step 4: Simplify right side
   1,513.56x = 1,862,821.84
5. Step 5: Solve for x
   x = 1,862,821.84/1,513.56
6. Step 6: Final answer
   x = 1,230.76