Finding the Fourth Proportional to 139,175.65, 192,061.29 and 78,745.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,175.65 : 192,061.29 = 78,745.78 : x
2. Step 2: Convert to fraction form
   139,175.65/192,061.29 = 78,745.78/x
3. Step 3: Cross multiply
   139,175.65x = 192,061.29 × 78,745.78
4. Step 4: Simplify right side
   139,175.65x = 15,124,016,088.86
5. Step 5: Solve for x
   x = 15,124,016,088.86/139,175.65
6. Step 6: Final answer
   x = 108,668.55