Finding the Fourth Proportional to 81,018.70, 111,775.98 and 50,805.28

Step by Step Solution

1. Step 1: Write the proportion equation
   81,018.70 : 111,775.98 = 50,805.28 : x
2. Step 2: Convert to fraction form
   81,018.70/111,775.98 = 50,805.28/x
3. Step 3: Cross multiply
   81,018.70x = 111,775.98 × 50,805.28
4. Step 4: Simplify right side
   81,018.70x = 5,678,809,961.17
5. Step 5: Solve for x
   x = 5,678,809,961.17/81,018.70
6. Step 6: Final answer
   x = 70,092.58