Finding the Third Proportional to 212,403 and 320,242.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,403 : 320,242.50 = 320,242.50 : x
2. Step 2: Convert to fraction form
   212,403/320,242.50 = 320,242.50/x
3. Step 3: Cross multiply
   212,403x = 320,242.50 × 320,242.50
4. Step 4: Simplify right side
   212,403x = 102,555,258,806.25
5. Step 5: Solve for x
   x = 102,555,258,806.25/212,403
6. Step 6: Final answer
   x = 482,833.38