Finding the Fourth Proportional to 139,072.96, 192,025.92 and 85,431.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,072.96 : 192,025.92 = 85,431.52 : x
2. Step 2: Convert to fraction form
   139,072.96/192,025.92 = 85,431.52/x
3. Step 3: Cross multiply
   139,072.96x = 192,025.92 × 85,431.52
4. Step 4: Simplify right side
   139,072.96x = 16,405,066,225.00
5. Step 5: Solve for x
   x = 16,405,066,225.00/139,072.96
6. Step 6: Final answer
   x = 117,960.14