Finding the Fourth Proportional to 78,863.63, 108,831.90 and 50,569.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,863.63 : 108,831.90 = 50,569.31 : x
2. Step 2: Convert to fraction form
   78,863.63/108,831.90 = 50,569.31/x
3. Step 3: Cross multiply
   78,863.63x = 108,831.90 × 50,569.31
4. Step 4: Simplify right side
   78,863.63x = 5,503,554,550.70
5. Step 5: Solve for x
   x = 5,503,554,550.70/78,863.63
6. Step 6: Final answer
   x = 69,785.72