Finding the Third Proportional to 439,830 and 659,623.50

Step by Step Solution

1. Step 1: Write the proportion equation
   439,830 : 659,623.50 = 659,623.50 : x
2. Step 2: Convert to fraction form
   439,830/659,623.50 = 659,623.50/x
3. Step 3: Cross multiply
   439,830x = 659,623.50 × 659,623.50
4. Step 4: Simplify right side
   439,830x = 435,103,161,752.25
5. Step 5: Solve for x
   x = 435,103,161,752.25/439,830
6. Step 6: Final answer
   x = 989,253.03