Finding the Fourth Proportional to 28,128.96, 42,182.88 and 10,589.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,128.96 : 42,182.88 = 10,589.28 : x
2. Step 2: Convert to fraction form
   28,128.96/42,182.88 = 10,589.28/x
3. Step 3: Cross multiply
   28,128.96x = 42,182.88 × 10,589.28
4. Step 4: Simplify right side
   28,128.96x = 446,686,327.53
5. Step 5: Solve for x
   x = 446,686,327.53/28,128.96
6. Step 6: Final answer
   x = 15,879.94