Finding the Fourth Proportional to 21,789.62, 30,068.42 and 12,228.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.62 : 30,068.42 = 12,228.62 : x
2. Step 2: Convert to fraction form
   21,789.62/30,068.42 = 12,228.62/x
3. Step 3: Cross multiply
   21,789.62x = 30,068.42 × 12,228.62
4. Step 4: Simplify right side
   21,789.62x = 367,695,308.62
5. Step 5: Solve for x
   x = 367,695,308.62/21,789.62
6. Step 6: Final answer
   x = 16,874.79