Finding the Fourth Proportional to 28,176.86, 42,286.71 and 10,424.31

Step by Step Solution

1. Step 1: Write the proportion equation
   28,176.86 : 42,286.71 = 10,424.31 : x
2. Step 2: Convert to fraction form
   28,176.86/42,286.71 = 10,424.31/x
3. Step 3: Cross multiply
   28,176.86x = 42,286.71 × 10,424.31
4. Step 4: Simplify right side
   28,176.86x = 440,809,773.92
5. Step 5: Solve for x
   x = 440,809,773.92/28,176.86
6. Step 6: Final answer
   x = 15,644.39