Finding the Third Proportional to 218,688.50 and 326,894

Step by Step Solution

1. Step 1: Write the proportion equation
   218,688.50 : 326,894 = 326,894 : x
2. Step 2: Convert to fraction form
   218,688.50/326,894 = 326,894/x
3. Step 3: Cross multiply
   218,688.50x = 326,894 × 326,894
4. Step 4: Simplify right side
   218,688.50x = 106,859,687,236
5. Step 5: Solve for x
   x = 106,859,687,236/218,688.50
6. Step 6: Final answer
   x = 488,638.80