Finding the Fourth Proportional to 20,582.28, 28,404.86 and 12,623.42

Step by Step Solution

1. Step 1: Write the proportion equation
   20,582.28 : 28,404.86 = 12,623.42 : x
2. Step 2: Convert to fraction form
   20,582.28/28,404.86 = 12,623.42/x
3. Step 3: Cross multiply
   20,582.28x = 28,404.86 × 12,623.42
4. Step 4: Simplify right side
   20,582.28x = 358,566,414.70
5. Step 5: Solve for x
   x = 358,566,414.70/20,582.28
6. Step 6: Final answer
   x = 17,421.12