Finding the Fourth Proportional to 139,157.03, 192,030.82 and 78,728.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139,157.03 : 192,030.82 = 78,728.71 : x
2. Step 2: Convert to fraction form
   139,157.03/192,030.82 = 78,728.71/x
3. Step 3: Cross multiply
   139,157.03x = 192,030.82 × 78,728.71
4. Step 4: Simplify right side
   139,157.03x = 15,118,338,061.94
5. Step 5: Solve for x
   x = 15,118,338,061.94/139,157.03
6. Step 6: Final answer
   x = 108,642.29