Finding the Fourth Proportional to 28,209.38, 42,308.58 and 10,680.58

Step by Step Solution

1. Step 1: Write the proportion equation
   28,209.38 : 42,308.58 = 10,680.58 : x
2. Step 2: Convert to fraction form
   28,209.38/42,308.58 = 10,680.58/x
3. Step 3: Cross multiply
   28,209.38x = 42,308.58 × 10,680.58
4. Step 4: Simplify right side
   28,209.38x = 451,879,961.83
5. Step 5: Solve for x
   x = 451,879,961.83/28,209.38
6. Step 6: Final answer
   x = 16,018.78