Finding the Fourth Proportional to 105,057, 144,978.66 and 57,310.54

Step by Step Solution

1. Step 1: Write the proportion equation
   105,057 : 144,978.66 = 57,310.54 : x
2. Step 2: Convert to fraction form
   105,057/144,978.66 = 57,310.54/x
3. Step 3: Cross multiply
   105,057x = 144,978.66 × 57,310.54
4. Step 4: Simplify right side
   105,057x = 8,308,804,930.63
5. Step 5: Solve for x
   x = 8,308,804,930.63/105,057
6. Step 6: Final answer
   x = 79,088.54