Finding the Third Proportional to 309,609.56 and 435,998.25

Step by Step Solution

1. Step 1: Write the proportion equation
   309,609.56 : 435,998.25 = 435,998.25 : x
2. Step 2: Convert to fraction form
   309,609.56/435,998.25 = 435,998.25/x
3. Step 3: Cross multiply
   309,609.56x = 435,998.25 × 435,998.25
4. Step 4: Simplify right side
   309,609.56x = 190,094,474,003.06
5. Step 5: Solve for x
   x = 190,094,474,003.06/309,609.56
6. Step 6: Final answer
   x = 613,981.28