Finding the Fourth Proportional to 105,112.35, 145,049.72 and 57,365.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,112.35 : 145,049.72 = 57,365.31 : x
2. Step 2: Convert to fraction form
   105,112.35/145,049.72 = 57,365.31/x
3. Step 3: Cross multiply
   105,112.35x = 145,049.72 × 57,365.31
4. Step 4: Simplify right side
   105,112.35x = 8,320,821,866.39
5. Step 5: Solve for x
   x = 8,320,821,866.39/105,112.35
6. Step 6: Final answer
   x = 79,161.22