Finding the Fourth Proportional to 28,568.01, 42,879.69 and 13,787.31

Step by Step Solution

1. Step 1: Write the proportion equation
   28,568.01 : 42,879.69 = 13,787.31 : x
2. Step 2: Convert to fraction form
   28,568.01/42,879.69 = 13,787.31/x
3. Step 3: Cross multiply
   28,568.01x = 42,879.69 × 13,787.31
4. Step 4: Simplify right side
   28,568.01x = 591,195,578.73
5. Step 5: Solve for x
   x = 591,195,578.73/28,568.01
6. Step 6: Final answer
   x = 20,694.32