Finding the Fourth Proportional to 80,781.28, 111,405.59 and 50,569.35

Step by Step Solution

1. Step 1: Write the proportion equation
   80,781.28 : 111,405.59 = 50,569.35 : x
2. Step 2: Convert to fraction form
   80,781.28/111,405.59 = 50,569.35/x
3. Step 3: Cross multiply
   80,781.28x = 111,405.59 × 50,569.35
4. Step 4: Simplify right side
   80,781.28x = 5,633,708,209.45
5. Step 5: Solve for x
   x = 5,633,708,209.45/80,781.28
6. Step 6: Final answer
   x = 69,740.27