Finding the Fourth Proportional to 78,321.47, 108,139.77 and 48,147.23

Step by Step Solution

1. Step 1: Write the proportion equation
   78,321.47 : 108,139.77 = 48,147.23 : x
2. Step 2: Convert to fraction form
   78,321.47/108,139.77 = 48,147.23/x
3. Step 3: Cross multiply
   78,321.47x = 108,139.77 × 48,147.23
4. Step 4: Simplify right side
   78,321.47x = 5,206,630,648.69
5. Step 5: Solve for x
   x = 5,206,630,648.69/78,321.47
6. Step 6: Final answer
   x = 66,477.70