Finding the Third Proportional to 222,819.50 and 329,315

Step by Step Solution

1. Step 1: Write the proportion equation
   222,819.50 : 329,315 = 329,315 : x
2. Step 2: Convert to fraction form
   222,819.50/329,315 = 329,315/x
3. Step 3: Cross multiply
   222,819.50x = 329,315 × 329,315
4. Step 4: Simplify right side
   222,819.50x = 108,448,369,225
5. Step 5: Solve for x
   x = 108,448,369,225/222,819.50
6. Step 6: Final answer
   x = 486,709.51