Finding the Fourth Proportional to 2,380.17, 3,570.06 and 820.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.17 : 3,570.06 = 820.17 : x
2. Step 2: Convert to fraction form
   2,380.17/3,570.06 = 820.17/x
3. Step 3: Cross multiply
   2,380.17x = 3,570.06 × 820.17
4. Step 4: Simplify right side
   2,380.17x = 2,928,052.01
5. Step 5: Solve for x
   x = 2,928,052.01/2,380.17
6. Step 6: Final answer
   x = 1,230.19