Finding the Fourth Proportional to 78,865.63, 108,834.66 and 50,571.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,865.63 : 108,834.66 = 50,571.31 : x
2. Step 2: Convert to fraction form
   78,865.63/108,834.66 = 50,571.31/x
3. Step 3: Cross multiply
   78,865.63x = 108,834.66 × 50,571.31
4. Step 4: Simplify right side
   78,865.63x = 5,503,911,329.60
5. Step 5: Solve for x
   x = 5,503,911,329.60/78,865.63
6. Step 6: Final answer
   x = 69,788.47