Finding the Third Proportional to 215,300 and 320,486

Step by Step Solution

1. Step 1: Write the proportion equation
   215,300 : 320,486 = 320,486 : x
2. Step 2: Convert to fraction form
   215,300/320,486 = 320,486/x
3. Step 3: Cross multiply
   215,300x = 320,486 × 320,486
4. Step 4: Simplify right side
   215,300x = 102,711,276,196
5. Step 5: Solve for x
   x = 102,711,276,196/215,300
6. Step 6: Final answer
   x = 477,061.20