Finding the Fourth Proportional to 105,665.97, 145,958.79 and 78,761.77

Step by Step Solution

1. Step 1: Write the proportion equation
   105,665.97 : 145,958.79 = 78,761.77 : x
2. Step 2: Convert to fraction form
   105,665.97/145,958.79 = 78,761.77/x
3. Step 3: Cross multiply
   105,665.97x = 145,958.79 × 78,761.77
4. Step 4: Simplify right side
   105,665.97x = 11,495,971,913.37
5. Step 5: Solve for x
   x = 11,495,971,913.37/105,665.97
6. Step 6: Final answer
   x = 108,795.41