Finding the Fourth Proportional to 105,690.27, 145,852.54 and 57,942.59

Step by Step Solution

1. Step 1: Write the proportion equation
   105,690.27 : 145,852.54 = 57,942.59 : x
2. Step 2: Convert to fraction form
   105,690.27/145,852.54 = 57,942.59/x
3. Step 3: Cross multiply
   105,690.27x = 145,852.54 × 57,942.59
4. Step 4: Simplify right side
   105,690.27x = 8,451,074,145.45
5. Step 5: Solve for x
   x = 8,451,074,145.45/105,690.27
6. Step 6: Final answer
   x = 79,960.76