Finding the Fourth Proportional to 105,705, 145,859.54 and 57,945.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,705 : 145,859.54 = 57,945.78 : x
2. Step 2: Convert to fraction form
   105,705/145,859.54 = 57,945.78/x
3. Step 3: Cross multiply
   105,705x = 145,859.54 × 57,945.78
4. Step 4: Simplify right side
   105,705x = 8,451,944,526.01
5. Step 5: Solve for x
   x = 8,451,944,526.01/105,705
6. Step 6: Final answer
   x = 79,957.85