Finding the Fourth Proportional to 78,857.86, 108,942.56 and 51,698.47

Step by Step Solution

1. Step 1: Write the proportion equation
   78,857.86 : 108,942.56 = 51,698.47 : x
2. Step 2: Convert to fraction form
   78,857.86/108,942.56 = 51,698.47/x
3. Step 3: Cross multiply
   78,857.86x = 108,942.56 × 51,698.47
4. Step 4: Simplify right side
   78,857.86x = 5,632,163,669.88
5. Step 5: Solve for x
   x = 5,632,163,669.88/78,857.86
6. Step 6: Final answer
   x = 71,421.72