Finding the Fourth Proportional to 139,110.72, 192,003.12 and 85,423.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139,110.72 : 192,003.12 = 85,423.92 : x
2. Step 2: Convert to fraction form
   139,110.72/192,003.12 = 85,423.92/x
3. Step 3: Cross multiply
   139,110.72x = 192,003.12 × 85,423.92
4. Step 4: Simplify right side
   139,110.72x = 16,401,659,162.63
5. Step 5: Solve for x
   x = 16,401,659,162.63/139,110.72
6. Step 6: Final answer
   x = 117,903.63