Finding the Fourth Proportional to 139,136.56, 192,006.88 and 78,706.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,136.56 : 192,006.88 = 78,706.24 : x
2. Step 2: Convert to fraction form
   139,136.56/192,006.88 = 78,706.24/x
3. Step 3: Cross multiply
   139,136.56x = 192,006.88 × 78,706.24
4. Step 4: Simplify right side
   139,136.56x = 15,112,139,578.93
5. Step 5: Solve for x
   x = 15,112,139,578.93/139,136.56
6. Step 6: Final answer
   x = 108,613.72