Finding the Fourth Proportional to 105,665.92, 145,810.64 and 60,945.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105,665.92 : 145,810.64 = 60,945.28 : x
2. Step 2: Convert to fraction form
   105,665.92/145,810.64 = 60,945.28/x
3. Step 3: Cross multiply
   105,665.92x = 145,810.64 × 60,945.28
4. Step 4: Simplify right side
   105,665.92x = 8,886,470,281.78
5. Step 5: Solve for x
   x = 8,886,470,281.78/105,665.92
6. Step 6: Final answer
   x = 84,099.68