Finding the Third Proportional to 150,256.50 and 317,280

Step by Step Solution

1. Step 1: Write the proportion equation
   150,256.50 : 317,280 = 317,280 : x
2. Step 2: Convert to fraction form
   150,256.50/317,280 = 317,280/x
3. Step 3: Cross multiply
   150,256.50x = 317,280 × 317,280
4. Step 4: Simplify right side
   150,256.50x = 100,666,598,400
5. Step 5: Solve for x
   x = 100,666,598,400/150,256.50
6. Step 6: Final answer
   x = 669,965.02