Finding the Third Proportional to 200,221.50 and 309,918

Step by Step Solution

1. Step 1: Write the proportion equation
   200,221.50 : 309,918 = 309,918 : x
2. Step 2: Convert to fraction form
   200,221.50/309,918 = 309,918/x
3. Step 3: Cross multiply
   200,221.50x = 309,918 × 309,918
4. Step 4: Simplify right side
   200,221.50x = 96,049,166,724
5. Step 5: Solve for x
   x = 96,049,166,724/200,221.50
6. Step 6: Final answer
   x = 479,714.55