Finding the Third Proportional to 156,960 and 339,990

Step by Step Solution

1. Step 1: Write the proportion equation
   156,960 : 339,990 = 339,990 : x
2. Step 2: Convert to fraction form
   156,960/339,990 = 339,990/x
3. Step 3: Cross multiply
   156,960x = 339,990 × 339,990
4. Step 4: Simplify right side
   156,960x = 115,593,200,100
5. Step 5: Solve for x
   x = 115,593,200,100/156,960
6. Step 6: Final answer
   x = 736,450.05