Finding the Fourth Proportional to 1,513.02, 2,270.49 and 820.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.02 : 2,270.49 = 820.17 : x
2. Step 2: Convert to fraction form
   1,513.02/2,270.49 = 820.17/x
3. Step 3: Cross multiply
   1,513.02x = 2,270.49 × 820.17
4. Step 4: Simplify right side
   1,513.02x = 1,862,187.78
5. Step 5: Solve for x
   x = 1,862,187.78/1,513.02
6. Step 6: Final answer
   x = 1,230.78