Finding the Fourth Proportional to 57,087.57, 78,728.79 and 49,018.68

Step by Step Solution

1. Step 1: Write the proportion equation
   57,087.57 : 78,728.79 = 49,018.68 : x
2. Step 2: Convert to fraction form
   57,087.57/78,728.79 = 49,018.68/x
3. Step 3: Cross multiply
   57,087.57x = 78,728.79 × 49,018.68
4. Step 4: Simplify right side
   57,087.57x = 3,859,181,363.80
5. Step 5: Solve for x
   x = 3,859,181,363.80/57,087.57
6. Step 6: Final answer
   x = 67,601.08