Finding the Third Proportional to 225,805.50 and 309,640.50

Step by Step Solution

1. Step 1: Write the proportion equation
   225,805.50 : 309,640.50 = 309,640.50 : x
2. Step 2: Convert to fraction form
   225,805.50/309,640.50 = 309,640.50/x
3. Step 3: Cross multiply
   225,805.50x = 309,640.50 × 309,640.50
4. Step 4: Simplify right side
   225,805.50x = 95,877,239,240.25
5. Step 5: Solve for x
   x = 95,877,239,240.25/225,805.50
6. Step 6: Final answer
   x = 424,600.99