Finding the Third Proportional to 215,967 and 321,700.50

Step by Step Solution

1. Step 1: Write the proportion equation
   215,967 : 321,700.50 = 321,700.50 : x
2. Step 2: Convert to fraction form
   215,967/321,700.50 = 321,700.50/x
3. Step 3: Cross multiply
   215,967x = 321,700.50 × 321,700.50
4. Step 4: Simplify right side
   215,967x = 103,491,211,700.25
5. Step 5: Solve for x
   x = 103,491,211,700.25/215,967
6. Step 6: Final answer
   x = 479,199.19