Finding the Fourth Proportional to 20,558.71, 30,834.69 and 7,228.58

Step by Step Solution

1. Step 1: Write the proportion equation
   20,558.71 : 30,834.69 = 7,228.58 : x
2. Step 2: Convert to fraction form
   20,558.71/30,834.69 = 7,228.58/x
3. Step 3: Cross multiply
   20,558.71x = 30,834.69 × 7,228.58
4. Step 4: Simplify right side
   20,558.71x = 222,890,895.27
5. Step 5: Solve for x
   x = 222,890,895.27/20,558.71
6. Step 6: Final answer
   x = 10,841.68