Finding the Fourth Proportional to 105,020.72, 144,929.76 and 57,273.92

Step by Step Solution

1. Step 1: Write the proportion equation
   105,020.72 : 144,929.76 = 57,273.92 : x
2. Step 2: Convert to fraction form
   105,020.72/144,929.76 = 57,273.92/x
3. Step 3: Cross multiply
   105,020.72x = 144,929.76 × 57,273.92
4. Step 4: Simplify right side
   105,020.72x = 8,300,695,479.86
5. Step 5: Solve for x
   x = 8,300,695,479.86/105,020.72
6. Step 6: Final answer
   x = 79,038.65