Finding the Third Proportional to 151,398 and 318,478.50

Step by Step Solution

1. Step 1: Write the proportion equation
   151,398 : 318,478.50 = 318,478.50 : x
2. Step 2: Convert to fraction form
   151,398/318,478.50 = 318,478.50/x
3. Step 3: Cross multiply
   151,398x = 318,478.50 × 318,478.50
4. Step 4: Simplify right side
   151,398x = 101,428,554,962.25
5. Step 5: Solve for x
   x = 101,428,554,962.25/151,398
6. Step 6: Final answer
   x = 669,946.47