Finding the Fourth Proportional to 105,687.03, 145,853.69 and 57,942.39

Step by Step Solution

1. Step 1: Write the proportion equation
   105,687.03 : 145,853.69 = 57,942.39 : x
2. Step 2: Convert to fraction form
   105,687.03/145,853.69 = 57,942.39/x
3. Step 3: Cross multiply
   105,687.03x = 145,853.69 × 57,942.39
4. Step 4: Simplify right side
   105,687.03x = 8,451,110,988.69
5. Step 5: Solve for x
   x = 8,451,110,988.69/105,687.03
6. Step 6: Final answer
   x = 79,963.56