Finding the Fourth Proportional to 105,518.48, 145,609.71 and 57,762.59

Step by Step Solution

1. Step 1: Write the proportion equation
   105,518.48 : 145,609.71 = 57,762.59 : x
2. Step 2: Convert to fraction form
   105,518.48/145,609.71 = 57,762.59/x
3. Step 3: Cross multiply
   105,518.48x = 145,609.71 × 57,762.59
4. Step 4: Simplify right side
   105,518.48x = 8,410,793,250.70
5. Step 5: Solve for x
   x = 8,410,793,250.70/105,518.48
6. Step 6: Final answer
   x = 79,709.20