Finding the Fourth Proportional to 80,739.20, 111,422.72 and 50,514.88

Step by Step Solution

1. Step 1: Write the proportion equation
   80,739.20 : 111,422.72 = 50,514.88 : x
2. Step 2: Convert to fraction form
   80,739.20/111,422.72 = 50,514.88/x
3. Step 3: Cross multiply
   80,739.20x = 111,422.72 × 50,514.88
4. Step 4: Simplify right side
   80,739.20x = 5,628,505,330.07
5. Step 5: Solve for x
   x = 5,628,505,330.07/80,739.20
6. Step 6: Final answer
   x = 69,712.18