Finding the Fourth Proportional to 105,105.72, 145,044 and 57,357.84

Step by Step Solution

1. Step 1: Write the proportion equation
   105,105.72 : 145,044 = 57,357.84 : x
2. Step 2: Convert to fraction form
   105,105.72/145,044 = 57,357.84/x
3. Step 3: Cross multiply
   105,105.72x = 145,044 × 57,357.84
4. Step 4: Simplify right side
   105,105.72x = 8,319,410,544.96
5. Step 5: Solve for x
   x = 8,319,410,544.96/105,105.72
6. Step 6: Final answer
   x = 79,152.79