Finding the Fourth Proportional to 20,358.63, 28,104.72 and 12,808.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,358.63 : 28,104.72 = 12,808.62 : x
2. Step 2: Convert to fraction form
   20,358.63/28,104.72 = 12,808.62/x
3. Step 3: Cross multiply
   20,358.63x = 28,104.72 × 12,808.62
4. Step 4: Simplify right side
   20,358.63x = 359,982,678.69
5. Step 5: Solve for x
   x = 359,982,678.69/20,358.63
6. Step 6: Final answer
   x = 17,682.07