Finding the Third Proportional to 216,918 and 470,737.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,918 : 470,737.50 = 470,737.50 : x
2. Step 2: Convert to fraction form
   216,918/470,737.50 = 470,737.50/x
3. Step 3: Cross multiply
   216,918x = 470,737.50 × 470,737.50
4. Step 4: Simplify right side
   216,918x = 221,593,793,906.25
5. Step 5: Solve for x
   x = 221,593,793,906.25/216,918
6. Step 6: Final answer
   x = 1,021,555.58