Finding the Third Proportional to 159,990 and 343,723.50

Step by Step Solution

1. Step 1: Write the proportion equation
   159,990 : 343,723.50 = 343,723.50 : x
2. Step 2: Convert to fraction form
   159,990/343,723.50 = 343,723.50/x
3. Step 3: Cross multiply
   159,990x = 343,723.50 × 343,723.50
4. Step 4: Simplify right side
   159,990x = 118,145,844,452.25
5. Step 5: Solve for x
   x = 118,145,844,452.25/159,990
6. Step 6: Final answer
   x = 738,457.68