Finding the Fourth Proportional to 105,329.49, 145,351.56 and 57,581.88

Step by Step Solution

1. Step 1: Write the proportion equation
   105,329.49 : 145,351.56 = 57,581.88 : x
2. Step 2: Convert to fraction form
   105,329.49/145,351.56 = 57,581.88/x
3. Step 3: Cross multiply
   105,329.49x = 145,351.56 × 57,581.88
4. Step 4: Simplify right side
   105,329.49x = 8,369,616,085.73
5. Step 5: Solve for x
   x = 8,369,616,085.73/105,329.49
6. Step 6: Final answer
   x = 79,461.28