Finding the Fourth Proportional to 139,397.83, 192,378.49 and 78,968.95

Step by Step Solution

1. Step 1: Write the proportion equation
   139,397.83 : 192,378.49 = 78,968.95 : x
2. Step 2: Convert to fraction form
   139,397.83/192,378.49 = 78,968.95/x
3. Step 3: Cross multiply
   139,397.83x = 192,378.49 × 78,968.95
4. Step 4: Simplify right side
   139,397.83x = 15,191,926,679.52
5. Step 5: Solve for x
   x = 15,191,926,679.52/139,397.83
6. Step 6: Final answer
   x = 108,982.52