Finding the Fourth Proportional to 105,517.56, 145,614.22 and 57,770.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105,517.56 : 145,614.22 = 57,770.89 : x
2. Step 2: Convert to fraction form
   105,517.56/145,614.22 = 57,770.89/x
3. Step 3: Cross multiply
   105,517.56x = 145,614.22 × 57,770.89
4. Step 4: Simplify right side
   105,517.56x = 8,412,263,123.65
5. Step 5: Solve for x
   x = 8,412,263,123.65/105,517.56
6. Step 6: Final answer
   x = 79,723.82