Finding the Fourth Proportional to 81,105.94, 111,113.28 and 78,073.61

Step by Step Solution

1. Step 1: Write the proportion equation
   81,105.94 : 111,113.28 = 78,073.61 : x
2. Step 2: Convert to fraction form
   81,105.94/111,113.28 = 78,073.61/x
3. Step 3: Cross multiply
   81,105.94x = 111,113.28 × 78,073.61
4. Step 4: Simplify right side
   81,105.94x = 8,675,013,942.61
5. Step 5: Solve for x
   x = 8,675,013,942.61/81,105.94
6. Step 6: Final answer
   x = 106,959.05