Finding the Fourth Proportional to 105,518.47, 145,609.72 and 57,762.58

Step by Step Solution

1. Step 1: Write the proportion equation
   105,518.47 : 145,609.72 = 57,762.58 : x
2. Step 2: Convert to fraction form
   105,518.47/145,609.72 = 57,762.58/x
3. Step 3: Cross multiply
   105,518.47x = 145,609.72 × 57,762.58
4. Step 4: Simplify right side
   105,518.47x = 8,410,792,591.85
5. Step 5: Solve for x
   x = 8,410,792,591.85/105,518.47
6. Step 6: Final answer
   x = 79,709.20