Finding the Fourth Proportional to 81,105.89, 111,113.21 and 78,073.56

Step by Step Solution

1. Step 1: Write the proportion equation
   81,105.89 : 111,113.21 = 78,073.56 : x
2. Step 2: Convert to fraction form
   81,105.89/111,113.21 = 78,073.56/x
3. Step 3: Cross multiply
   81,105.89x = 111,113.21 × 78,073.56
4. Step 4: Simplify right side
   81,105.89x = 8,675,003,867.73
5. Step 5: Solve for x
   x = 8,675,003,867.73/81,105.89
6. Step 6: Final answer
   x = 106,958.99