Finding the Fourth Proportional to 105,736.73, 145,829.57 and 65,412.09

Step by Step Solution

1. Step 1: Write the proportion equation
   105,736.73 : 145,829.57 = 65,412.09 : x
2. Step 2: Convert to fraction form
   105,736.73/145,829.57 = 65,412.09/x
3. Step 3: Cross multiply
   105,736.73x = 145,829.57 × 65,412.09
4. Step 4: Simplify right side
   105,736.73x = 9,539,016,630.44
5. Step 5: Solve for x
   x = 9,539,016,630.44/105,736.73
6. Step 6: Final answer
   x = 90,214.79