Finding the Fourth Proportional to 105,391.83, 145,441.88 and 57,644.16

Step by Step Solution

1. Step 1: Write the proportion equation
   105,391.83 : 145,441.88 = 57,644.16 : x
2. Step 2: Convert to fraction form
   105,391.83/145,441.88 = 57,644.16/x
3. Step 3: Cross multiply
   105,391.83x = 145,441.88 × 57,644.16
4. Step 4: Simplify right side
   105,391.83x = 8,383,874,383.96
5. Step 5: Solve for x
   x = 8,383,874,383.96/105,391.83
6. Step 6: Final answer
   x = 79,549.56