Finding the Fourth Proportional to 89,731, 123,831.34 and 49,989.56

Step by Step Solution

1. Step 1: Write the proportion equation
   89,731 : 123,831.34 = 49,989.56 : x
2. Step 2: Convert to fraction form
   89,731/123,831.34 = 49,989.56/x
3. Step 3: Cross multiply
   89,731x = 123,831.34 × 49,989.56
4. Step 4: Simplify right side
   89,731x = 6,190,274,200.81
5. Step 5: Solve for x
   x = 6,190,274,200.81/89,731
6. Step 6: Final answer
   x = 68,987.02