Finding the Fourth Proportional to 105,517.37, 145,613.90 and 57,770.70

Step by Step Solution

1. Step 1: Write the proportion equation
   105,517.37 : 145,613.90 = 57,770.70 : x
2. Step 2: Convert to fraction form
   105,517.37/145,613.90 = 57,770.70/x
3. Step 3: Cross multiply
   105,517.37x = 145,613.90 × 57,770.70
4. Step 4: Simplify right side
   105,517.37x = 8,412,216,643.88
5. Step 5: Solve for x
   x = 8,412,216,643.88/105,517.37
6. Step 6: Final answer
   x = 79,723.53