Finding the Fourth Proportional to 57,879, 86,776.20 and 39,112.38

Step by Step Solution

1. Step 1: Write the proportion equation
   57,879 : 86,776.20 = 39,112.38 : x
2. Step 2: Convert to fraction form
   57,879/86,776.20 = 39,112.38/x
3. Step 3: Cross multiply
   57,879x = 86,776.20 × 39,112.38
4. Step 4: Simplify right side
   57,879x = 3,394,023,709.36
5. Step 5: Solve for x
   x = 3,394,023,709.36/57,879
6. Step 6: Final answer
   x = 58,639.99