Finding the Third Proportional to 309,086 and 651,381.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,086 : 651,381.50 = 651,381.50 : x
2. Step 2: Convert to fraction form
   309,086/651,381.50 = 651,381.50/x
3. Step 3: Cross multiply
   309,086x = 651,381.50 × 651,381.50
4. Step 4: Simplify right side
   309,086x = 424,297,858,542.25
5. Step 5: Solve for x
   x = 424,297,858,542.25/309,086
6. Step 6: Final answer
   x = 1,372,750.17