Finding the Fourth Proportional to 105,517.69, 145,618.09 and 57,771.43

Step by Step Solution

1. Step 1: Write the proportion equation
   105,517.69 : 145,618.09 = 57,771.43 : x
2. Step 2: Convert to fraction form
   105,517.69/145,618.09 = 57,771.43/x
3. Step 3: Cross multiply
   105,517.69x = 145,618.09 × 57,771.43
4. Step 4: Simplify right side
   105,517.69x = 8,412,564,784.69
5. Step 5: Solve for x
   x = 8,412,564,784.69/105,517.69
6. Step 6: Final answer
   x = 79,726.58