Finding the Third Proportional to 345,609 and 494,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   345,609 : 494,221.50 = 494,221.50 : x
2. Step 2: Convert to fraction form
   345,609/494,221.50 = 494,221.50/x
3. Step 3: Cross multiply
   345,609x = 494,221.50 × 494,221.50
4. Step 4: Simplify right side
   345,609x = 244,254,891,062.25
5. Step 5: Solve for x
   x = 244,254,891,062.25/345,609
6. Step 6: Final answer
   x = 706,737.65