Finding the Fourth Proportional to 89,728, 123,827.20 and 49,986.56

Step by Step Solution

1. Step 1: Write the proportion equation
   89,728 : 123,827.20 = 49,986.56 : x
2. Step 2: Convert to fraction form
   89,728/123,827.20 = 49,986.56/x
3. Step 3: Cross multiply
   89,728x = 123,827.20 × 49,986.56
4. Step 4: Simplify right side
   89,728x = 6,189,695,762.43
5. Step 5: Solve for x
   x = 6,189,695,762.43/89,728
6. Step 6: Final answer
   x = 68,982.88