Finding the Fourth Proportional to 139,640.10, 209,334.52 and 50,831.29

Step by Step Solution

1. Step 1: Write the proportion equation
   139,640.10 : 209,334.52 = 50,831.29 : x
2. Step 2: Convert to fraction form
   139,640.10/209,334.52 = 50,831.29/x
3. Step 3: Cross multiply
   139,640.10x = 209,334.52 × 50,831.29
4. Step 4: Simplify right side
   139,640.10x = 10,640,743,693.13
5. Step 5: Solve for x
   x = 10,640,743,693.13/139,640.10
6. Step 6: Final answer
   x = 76,201.20