Finding the Third Proportional to 312,726 and 609,900

Step by Step Solution

1. Step 1: Write the proportion equation
   312,726 : 609,900 = 609,900 : x
2. Step 2: Convert to fraction form
   312,726/609,900 = 609,900/x
3. Step 3: Cross multiply
   312,726x = 609,900 × 609,900
4. Step 4: Simplify right side
   312,726x = 371,978,010,000
5. Step 5: Solve for x
   x = 371,978,010,000/312,726
6. Step 6: Final answer
   x = 1,189,469.41