Finding the Fourth Proportional to 105,755.76, 145,942.56 and 65,461.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,755.76 : 145,942.56 = 65,461.50 : x
2. Step 2: Convert to fraction form
   105,755.76/145,942.56 = 65,461.50/x
3. Step 3: Cross multiply
   105,755.76x = 145,942.56 × 65,461.50
4. Step 4: Simplify right side
   105,755.76x = 9,553,618,891.44
5. Step 5: Solve for x
   x = 9,553,618,891.44/105,755.76
6. Step 6: Final answer
   x = 90,336.63