Finding the Fourth Proportional to 105,456.89, 145,530.51 and 57,710.24

Step by Step Solution

1. Step 1: Write the proportion equation
   105,456.89 : 145,530.51 = 57,710.24 : x
2. Step 2: Convert to fraction form
   105,456.89/145,530.51 = 57,710.24/x
3. Step 3: Cross multiply
   105,456.89x = 145,530.51 × 57,710.24
4. Step 4: Simplify right side
   105,456.89x = 8,398,600,659.42
5. Step 5: Solve for x
   x = 8,398,600,659.42/105,456.89
6. Step 6: Final answer
   x = 79,640.13