Finding the Fourth Proportional to 28,112.58, 42,164.62 and 10,578.32

Step by Step Solution

1. Step 1: Write the proportion equation
   28,112.58 : 42,164.62 = 10,578.32 : x
2. Step 2: Convert to fraction form
   28,112.58/42,164.62 = 10,578.32/x
3. Step 3: Cross multiply
   28,112.58x = 42,164.62 × 10,578.32
4. Step 4: Simplify right side
   28,112.58x = 446,030,843.04
5. Step 5: Solve for x
   x = 446,030,843.04/28,112.58
6. Step 6: Final answer
   x = 15,865.88