Finding the Third Proportional to 65,990 and 139,405

Step by Step Solution

1. Step 1: Write the proportion equation
   65,990 : 139,405 = 139,405 : x
2. Step 2: Convert to fraction form
   65,990/139,405 = 139,405/x
3. Step 3: Cross multiply
   65,990x = 139,405 × 139,405
4. Step 4: Simplify right side
   65,990x = 19,433,754,025
5. Step 5: Solve for x
   x = 19,433,754,025/65,990
6. Step 6: Final answer
   x = 294,495.44