Finding the Third Proportional to 609,621 and 905,600.25

Step by Step Solution

1. Step 1: Write the proportion equation
   609,621 : 905,600.25 = 905,600.25 : x
2. Step 2: Convert to fraction form
   609,621/905,600.25 = 905,600.25/x
3. Step 3: Cross multiply
   609,621x = 905,600.25 × 905,600.25
4. Step 4: Simplify right side
   609,621x = 820,111,812,800.06
5. Step 5: Solve for x
   x = 820,111,812,800.06/609,621
6. Step 6: Final answer
   x = 1,345,281.43