Finding the Fourth Proportional to 50,756.72, 70,042.20 and 28,399.28

Step by Step Solution

1. Step 1: Write the proportion equation
   50,756.72 : 70,042.20 = 28,399.28 : x
2. Step 2: Convert to fraction form
   50,756.72/70,042.20 = 28,399.28/x
3. Step 3: Cross multiply
   50,756.72x = 70,042.20 × 28,399.28
4. Step 4: Simplify right side
   50,756.72x = 1,989,148,049.62
5. Step 5: Solve for x
   x = 1,989,148,049.62/50,756.72
6. Step 6: Final answer
   x = 39,189.85