Finding the Fourth Proportional to 105,697.38, 145,871.55 and 57,960.03

Step by Step Solution

1. Step 1: Write the proportion equation
   105,697.38 : 145,871.55 = 57,960.03 : x
2. Step 2: Convert to fraction form
   105,697.38/145,871.55 = 57,960.03/x
3. Step 3: Cross multiply
   105,697.38x = 145,871.55 × 57,960.03
4. Step 4: Simplify right side
   105,697.38x = 8,454,719,414.15
5. Step 5: Solve for x
   x = 8,454,719,414.15/105,697.38
6. Step 6: Final answer
   x = 79,989.87