Finding the Third Proportional to 212,842.50 and 317,418

Step by Step Solution

1. Step 1: Write the proportion equation
   212,842.50 : 317,418 = 317,418 : x
2. Step 2: Convert to fraction form
   212,842.50/317,418 = 317,418/x
3. Step 3: Cross multiply
   212,842.50x = 317,418 × 317,418
4. Step 4: Simplify right side
   212,842.50x = 100,754,186,724
5. Step 5: Solve for x
   x = 100,754,186,724/212,842.50
6. Step 6: Final answer
   x = 473,374.38