Finding the Fourth Proportional to 139,284.93, 192,217.55 and 78,854.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,284.93 : 192,217.55 = 78,854.48 : x
2. Step 2: Convert to fraction form
   139,284.93/192,217.55 = 78,854.48/x
3. Step 3: Cross multiply
   139,284.93x = 192,217.55 × 78,854.48
4. Step 4: Simplify right side
   139,284.93x = 15,157,213,596.76
5. Step 5: Solve for x
   x = 15,157,213,596.76/139,284.93
6. Step 6: Final answer
   x = 108,821.63