Finding the Fourth Proportional to 105,619.50, 145,754.91 and 57,874.73

Step by Step Solution

1. Step 1: Write the proportion equation
   105,619.50 : 145,754.91 = 57,874.73 : x
2. Step 2: Convert to fraction form
   105,619.50/145,754.91 = 57,874.73/x
3. Step 3: Cross multiply
   105,619.50x = 145,754.91 × 57,874.73
4. Step 4: Simplify right side
   105,619.50x = 8,435,525,333.65
5. Step 5: Solve for x
   x = 8,435,525,333.65/105,619.50
6. Step 6: Final answer
   x = 79,867.12