Finding the Third Proportional to 91,218 and 200,418

Step by Step Solution

1. Step 1: Write the proportion equation
   91,218 : 200,418 = 200,418 : x
2. Step 2: Convert to fraction form
   91,218/200,418 = 200,418/x
3. Step 3: Cross multiply
   91,218x = 200,418 × 200,418
4. Step 4: Simplify right side
   91,218x = 40,167,374,724
5. Step 5: Solve for x
   x = 40,167,374,724/91,218
6. Step 6: Final answer
   x = 440,344.83