Finding the Third Proportional to 309,620 and 436,011.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,620 : 436,011.50 = 436,011.50 : x
2. Step 2: Convert to fraction form
   309,620/436,011.50 = 436,011.50/x
3. Step 3: Cross multiply
   309,620x = 436,011.50 × 436,011.50
4. Step 4: Simplify right side
   309,620x = 190,106,028,132.25
5. Step 5: Solve for x
   x = 190,106,028,132.25/309,620
6. Step 6: Final answer
   x = 613,997.89