Finding the Fourth Proportional to 139,579.89, 192,651.25 and 85,144.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,579.89 : 192,651.25 = 85,144.09 : x
2. Step 2: Convert to fraction form
   139,579.89/192,651.25 = 85,144.09/x
3. Step 3: Cross multiply
   139,579.89x = 192,651.25 × 85,144.09
4. Step 4: Simplify right side
   139,579.89x = 16,403,114,674.12
5. Step 5: Solve for x
   x = 16,403,114,674.12/139,579.89
6. Step 6: Final answer
   x = 117,517.75