Finding the Fourth Proportional to 105,057.71, 144,979.57 and 57,310.94

Step by Step Solution

1. Step 1: Write the proportion equation
   105,057.71 : 144,979.57 = 57,310.94 : x
2. Step 2: Convert to fraction form
   105,057.71/144,979.57 = 57,310.94/x
3. Step 3: Cross multiply
   105,057.71x = 144,979.57 × 57,310.94
4. Step 4: Simplify right side
   105,057.71x = 8,308,915,871.58
5. Step 5: Solve for x
   x = 8,308,915,871.58/105,057.71
6. Step 6: Final answer
   x = 79,089.06