Finding the Third Proportional to 300,458.50 and 609,215

Step by Step Solution

1. Step 1: Write the proportion equation
   300,458.50 : 609,215 = 609,215 : x
2. Step 2: Convert to fraction form
   300,458.50/609,215 = 609,215/x
3. Step 3: Cross multiply
   300,458.50x = 609,215 × 609,215
4. Step 4: Simplify right side
   300,458.50x = 371,142,916,225
5. Step 5: Solve for x
   x = 371,142,916,225/300,458.50
6. Step 6: Final answer
   x = 1,235,255.17