Finding the Fourth Proportional to 105,457.34, 145,530.86 and 57,710.27

Step by Step Solution

1. Step 1: Write the proportion equation
   105,457.34 : 145,530.86 = 57,710.27 : x
2. Step 2: Convert to fraction form
   105,457.34/145,530.86 = 57,710.27/x
3. Step 3: Cross multiply
   105,457.34x = 145,530.86 × 57,710.27
4. Step 4: Simplify right side
   105,457.34x = 8,398,624,207.73
5. Step 5: Solve for x
   x = 8,398,624,207.73/105,457.34
6. Step 6: Final answer
   x = 79,640.02