Finding the Fourth Proportional to 139,139.41, 192,012.45 and 78,708.79

Step by Step Solution

1. Step 1: Write the proportion equation
   139,139.41 : 192,012.45 = 78,708.79 : x
2. Step 2: Convert to fraction form
   139,139.41/192,012.45 = 78,708.79/x
3. Step 3: Cross multiply
   139,139.41x = 192,012.45 × 78,708.79
4. Step 4: Simplify right side
   139,139.41x = 15,113,067,604.44
5. Step 5: Solve for x
   x = 15,113,067,604.44/139,139.41
6. Step 6: Final answer
   x = 108,618.17