Finding the Fourth Proportional to 105,647.46, 145,794.78 and 57,899.79

Step by Step Solution

1. Step 1: Write the proportion equation
   105,647.46 : 145,794.78 = 57,899.79 : x
2. Step 2: Convert to fraction form
   105,647.46/145,794.78 = 57,899.79/x
3. Step 3: Cross multiply
   105,647.46x = 145,794.78 × 57,899.79
4. Step 4: Simplify right side
   105,647.46x = 8,441,487,145.10
5. Step 5: Solve for x
   x = 8,441,487,145.10/105,647.46
6. Step 6: Final answer
   x = 79,902.41