Finding the Fourth Proportional to 105,676.48, 145,834.72 and 57,928.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,676.48 : 145,834.72 = 57,928.80 : x
2. Step 2: Convert to fraction form
   105,676.48/145,834.72 = 57,928.80/x
3. Step 3: Cross multiply
   105,676.48x = 145,834.72 × 57,928.80
4. Step 4: Simplify right side
   105,676.48x = 8,448,030,327.94
5. Step 5: Solve for x
   x = 8,448,030,327.94/105,676.48
6. Step 6: Final answer
   x = 79,942.39