Finding the Fourth Proportional to 82,409.57, 123,486.47 and 57,158.38

Step by Step Solution

1. Step 1: Write the proportion equation
   82,409.57 : 123,486.47 = 57,158.38 : x
2. Step 2: Convert to fraction form
   82,409.57/123,486.47 = 57,158.38/x
3. Step 3: Cross multiply
   82,409.57x = 123,486.47 × 57,158.38
4. Step 4: Simplify right side
   82,409.57x = 7,058,285,982.61
5. Step 5: Solve for x
   x = 7,058,285,982.61/82,409.57
6. Step 6: Final answer
   x = 85,648.87