Finding the Fourth Proportional to 2,069.25, 3,103.90 and 820.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.25 : 3,103.90 = 820.15 : x
2. Step 2: Convert to fraction form
   2,069.25/3,103.90 = 820.15/x
3. Step 3: Cross multiply
   2,069.25x = 3,103.90 × 820.15
4. Step 4: Simplify right side
   2,069.25x = 2,545,653.77
5. Step 5: Solve for x
   x = 2,545,653.77/2,069.25
6. Step 6: Final answer
   x = 1,230.23