Finding the Fourth Proportional to 28,106.82, 42,153.75 and 10,578.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,106.82 : 42,153.75 = 10,578.42 : x
2. Step 2: Convert to fraction form
   28,106.82/42,153.75 = 10,578.42/x
3. Step 3: Cross multiply
   28,106.82x = 42,153.75 × 10,578.42
4. Step 4: Simplify right side
   28,106.82x = 445,920,072.08
5. Step 5: Solve for x
   x = 445,920,072.08/28,106.82
6. Step 6: Final answer
   x = 15,865.19