Finding the Fourth Proportional to 139,132.72, 192,033.48 and 85,445.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139,132.72 : 192,033.48 = 85,445.92 : x
2. Step 2: Convert to fraction form
   139,132.72/192,033.48 = 85,445.92/x
3. Step 3: Cross multiply
   139,132.72x = 192,033.48 × 85,445.92
4. Step 4: Simplify right side
   139,132.72x = 16,408,477,369.40
5. Step 5: Solve for x
   x = 16,408,477,369.40/139,132.72
6. Step 6: Final answer
   x = 117,933.99