Finding the Third Proportional to 91,389 and 200,432

Step by Step Solution

1. Step 1: Write the proportion equation
   91,389 : 200,432 = 200,432 : x
2. Step 2: Convert to fraction form
   91,389/200,432 = 200,432/x
3. Step 3: Cross multiply
   91,389x = 200,432 × 200,432
4. Step 4: Simplify right side
   91,389x = 40,172,986,624
5. Step 5: Solve for x
   x = 40,172,986,624/91,389
6. Step 6: Final answer
   x = 439,582.30