Finding the Fourth Proportional to 50,800.50, 70,104.90 and 28,139

Step by Step Solution

1. Step 1: Write the proportion equation
   50,800.50 : 70,104.90 = 28,139 : x
2. Step 2: Convert to fraction form
   50,800.50/70,104.90 = 28,139/x
3. Step 3: Cross multiply
   50,800.50x = 70,104.90 × 28,139
4. Step 4: Simplify right side
   50,800.50x = 1,972,681,781.10
5. Step 5: Solve for x
   x = 1,972,681,781.10/50,800.50
6. Step 6: Final answer
   x = 38,831.94