Finding the Third Proportional to 215,145 and 321,259.50

Step by Step Solution

1. Step 1: Write the proportion equation
   215,145 : 321,259.50 = 321,259.50 : x
2. Step 2: Convert to fraction form
   215,145/321,259.50 = 321,259.50/x
3. Step 3: Cross multiply
   215,145x = 321,259.50 × 321,259.50
4. Step 4: Simplify right side
   215,145x = 103,207,666,340.25
5. Step 5: Solve for x
   x = 103,207,666,340.25/215,145
6. Step 6: Final answer
   x = 479,712.13