Finding the Third Proportional to 386,208 and 807,727.50

Step by Step Solution

1. Step 1: Write the proportion equation
   386,208 : 807,727.50 = 807,727.50 : x
2. Step 2: Convert to fraction form
   386,208/807,727.50 = 807,727.50/x
3. Step 3: Cross multiply
   386,208x = 807,727.50 × 807,727.50
4. Step 4: Simplify right side
   386,208x = 652,423,714,256.25
5. Step 5: Solve for x
   x = 652,423,714,256.25/386,208
6. Step 6: Final answer
   x = 1,689,306.58